Davis CupFinished

Predictions graded

Chun Hsin Tseng #220Taiwan2Olle Wallin #407Sweden0

Sets 6-1 · 6-4Sun 20 Sept 2026, 05:10 Predictions graded

Predictions6–367%

Player Profiles

Ranking advantageChun Hsin Tseng · 187 places

Chun Hsin Tseng

Taiwan

Tseng, 25, is the right-hander in this matchup. He reached a career-high No. 83 in August 2022 and has recorded more career wins on clay than on any other surface.

Current ranking: #220
Peak ranking: #83 · 2022
Current age: 25
Preferred surface: Clay
Hand: Right handed
Height: 175 cm

Olle Wallin

Sweden

The Swedish right-hander reached a career-high singles ranking of No. 368 in July 2026. No reliable public source identified a declared preferred surface.

Current ranking: #407
Peak ranking: #368 · 2026
Current age: 24
Preferred surface: —
Hand: Right handed
Height: 191 cm

Quick Take

Pre-match view

Context last updated 19 Sep 2026, 20:40 · Europe/Bucharest

Chun Hsin Tseng is favored over Olle Wallin but only marginally, with medium confidence.

Key angles: Over 5.5 aces (70%), Over 21.5 games (56%), and Wallin +3.5 games (55%). Avoid Tseng -3.5 and the short set-one price. Tseng's freshness and serve stats give him the edge, but Wallin's recent form keeps it close.

Context

Tseng is the higher-ranked player here at No. 208, and his 2026 record leans clay (21-18 clay, 5-6 hard). Wallin, a 191cm Swede ranked No. 407, has won 64.5% of 200 career matches, and 14 of his last 15 matches were played on clay.
Wallin's best wins in the window came over Carballes Baena (212) and Giustino (204); he lost to all three top-175 opponents he faced (Kolar 173, Guerrieri 167, Choinski 74). Tseng's wins span ranks 265 to 794, his only top-100 meeting was Molcan retiring at 2-6 6-3 2-0, and his two most recent matches were straight-sets defeats to Castelnuovo (398) and Samrej (387).
- Last-15 records, both tracked across all 15 matches: Wallin 10-5 (66.7%), Tseng 8-7 (53.3%).
- Wallin's five losses came to Kolar (173), Guerrieri (167), Choinski (74), Nikles (397) and Taberner (418).
- Tseng's two most recent matches: 3-6 7-6(7) 6-2 loss to Castelnuovo (398) on 8 September and 6-3 7-6(1) loss to Samrej (387) on 5 September, both on hard.
- Tseng's only top-100 opponent in the window was Molcan (94), who retired at 2-6 6-3 2-0 in Tseng's favour on 4 August.
Tseng, playing for Chinese Taipei, needed 59 minutes to beat Karl Friberg 6-3, 6-0 on day one in Taipei. Sweden's Wallin had already spent three sets beating Yu Hsiou Hsu 3-6, 6-2, 7-5 after trailing 0-3 in the deciding set.
Tseng goes into the next singles with far less court time behind him, which matters when a Davis Cup tie leaves little recovery time between days. Wallin's three-setter is the heavier workload, though the same match also shows he can close out a deciding set from 0-3 down, so day-one minutes alone do not settle who is fresher.
- The first-day singles finished 1-1, with Tseng completing his match in 59 minutes and Wallin playing a three-set comeback.
ReportedSources checked 19 Sep 2026, 20:38 · Europe/BucharestChinese Taipei level Davis Cup tie with Sweden after opening-day singleswww.nownews.com · 19 Sep 2026
Wallin's clay numbers in the window are strong: 72.8% of first-serve points won and 5.6 aces per match across 14 tracked matches. Tseng has split his last 15 between clay (9 matches) and hard (5), with a 2026 surface record of 21-18 on clay and 5-6 on hard.
Wallin's only hard-court match in the window was a 1-6 4-6 loss to Guerrieri (167) on 4 August, with five double faults, so his clay form is well supported but has no hard-court backing. Tseng's five-match hard sample is 3-2 with 74.6% first-serve points won against 63.9% on clay, which is thin support for a trend.
- Wallin last 15 by surface: clay 10-4 (14 matches tracked), hard 0-1; the hard match was a 1-6 4-6 loss to Andrea Guerrieri (167).
- Tseng last 15 by surface: clay 5-4 (9 matches), hard 3-2 (5 matches), grass 0-1 (1 match).
- Tseng's hard serve numbers beat his clay ones in the window: 74.6% first-serve points won and 69.6% break points saved on hard, against 63.9% and 57.6% on clay.
- Neither hard-court sample supports a trend on its own; Wallin's is a single match and Tseng's is five.
Wallin, listed at 191cm, wins 71.9% of first-serve points across all 15 tracked matches. Tseng, at 175cm, wins 68.3% on first serve but holds 50.1% on second serve, against Wallin's 45.8%.
Wallin's 2.9 double faults per match is the clearest serve gap between them and sits beside a first serve that wins more points than Tseng's. Return points won are level (40.8% to 40.5%), so the difference is likely to show up in how serve games close rather than in baseline exchanges.
- Last 15, all 15 matches tracked: Wallin 5.4 aces and 2.9 double faults per match; Tseng 3.0 aces and 1.1 double faults per match.
- First-serve points won: Wallin 71.9% (505/702), Tseng 68.3% (449/657). Second-serve points won: Tseng 50.1% (181/361), Wallin 45.8% (227/496).
- Break points converted: Tseng 42.1% (45/107), Wallin 37.0% (50/135). Break points saved: Wallin 62.7% (69/110), Tseng 60.8% (59/97).
- Return points won: Wallin 40.8% (492/1205), Tseng 40.5% (430/1063).

BetBugs probabilities

How likely BetBugs thought each outcome was.

Result1 of 1 landed

Signal quality Medium · Uncertainty band Lean · Not priced
The read
Ranking level, superior quality of opposition faced, cleaner serve/return conversion, and a reportedly much lighter day-one workload give Tseng the edge despite Wallin's marginally better recent win rate (surface is not specified in the feed, which caps confidence).
- Ranking edge: Tseng #208 vs Wallin #407; Tseng career 56.8% wins over 525 matches at Challenger/ATP level vs Wallin 64.5% over 200 matches at a lower tier.
- Last-15 window: Tseng 8-7 (53.3%) with 51.6% games won; Wallin 10-5 (66.7%) with 52.9% games won — recent form favours Wallin, so this is not a large edge.
- Serve/return structure: Tseng 1st-serve points won 68.3%, 1.1 double faults/match, 42.1% break points converted (last 15) vs Wallin 71.9%/2.9 DF/37.0% — Tseng cleaner on serve+return conversion.
- Workload (19 Sep, Taipei): Tseng reportedly won 6-3 6-0 in 59 minutes on day one while Wallin needed a 3-6 6-2 7-5 comeback — Tseng enters fresher.
BetBugs · Match WinnerwonChun Hsin TsengEstimated chance60%

Games2 of 4 landed

Signal quality Medium · Uncertainty band Slight lean · Not priced
The read
Near-identical recent games-won rates plus Wallin's high deciding-set frequency in the last 15 matches point to a long Bo3 even though Tseng is the fresher and higher-ranked player.
- Average total games per match in the recent window: Tseng 318/15 = 21.2; Wallin 359/15 = 23.9.
- Both players sit almost level on recent games-won percentage: Tseng 51.6%, Wallin 52.9% (last 15), implying long, balanced sets.
- Wallin has gone to a deciding set in 8 of his last 15 matches, a pattern that inflates total games.
- Average match duration in the window: 108.9 minutes (Tseng) and 110.2 minutes (Wallin).
BetBugs · Total GameslostOver 21.5Estimated chance56%
Signal quality Low · Uncertainty band Slight lean · Not priced
The read
With near-identical recent games-won rates and Wallin in good short-term form, the underdog covering a small game spread is the value side even though Tseng is favoured outright.
- Recent games-won percentage is nearly identical: Tseng 51.6% vs Wallin 52.9% (last 15).
- Wallin's 66.7% recent match win rate (10-5) is better than Tseng's 53.3% (8-7).
- Both players average over 100 minutes per match in the window, consistent with tight, close game margins.
BetBugs · Game HandicapwonOlle Wallin +3.5Estimated chance55%
Signal quality Low · Uncertainty band Slight lean · Not priced
The read
Wallin's long opening sets in the recent window plus balanced break-point conversion on both sides push set one just past the 9.5-game line.
- Recent window set length: Tseng 318 games / 36 sets = 8.8 per set; Wallin 359 / 38 = 9.4 per set.
- Wallin's last-5 opening sets include 7-6(4), 7-5 and 5-7 scorelines, frequently clearing 10 games.
- Both players convert around 40% of break points recently, limiting one-sided sets.
BetBugs · Set 1 Total GameslostOver 9.5Estimated chance53%
Signal quality Low · Uncertainty band Slight lean · Not priced
The read
Second sets in both players' recent windows tend to be tight multi-break or tiebreak-adjacent affairs, supporting a marginal Over 9.5.
- Average set length in the recent window: 8.8 games (Tseng) and 9.4 games (Wallin) across 36 and 38 sets respectively.
- Tseng's recent second sets include 7-6(7), 7-6(1) and 6-3 scorelines, with his last-5 showing tight 7-5/6-3 second-set finishes.
- Wallin has 8 three-set matches in his last 15, a proxy for extended set scores.
BetBugs · Set 2 Total GameswonOver 9.5Estimated chance53%

Sets2 of 3 landed

Signal quality Medium · Uncertainty band Lean · Not priced
The read
Recent-window serve strength and Tseng's strong first-set conversion, plus Wallin's habit of starting slowly in the last five matches, tilt set one to Tseng.
- Tseng career first-set win conversion 84% and first-15-window 1st-serve points won 68.3%, supporting an early-set edge.
- Tseng's last-5 record is 3-2 with three straight-set wins to open matches on hard (6-4 6-0, 7-5 6-3, 6-3 6-3).
- Wallin's last-5 shows slow starts: dropped the opening set in 4-6 and 3-6 losses and trailed in a three-set comeback (last 15 window).
BetBugs · Set 1 WinnerwonChun Hsin TsengEstimated chance58%
Signal quality Medium · Uncertainty band Slight lean · Not priced
The read
Set-level serve structure and Wallin's weak second-serve numbers plus his heavy three-set load in the recent window keep Tseng favoured in set two, though at lower confidence than the match line.
- Tseng last-15: 20/36 sets won (55.6%) with 68.3% 1st-serve points won; Wallin 22/38 sets won (57.9%) but with 2.9 double faults/match.
- Wallin's second serve is the weak point in the recent window: only 45.8% second-serve points won (last 15).
- Wallin has played 8 three-set matches in his last 15, a fatigue/fragility pattern that raises second-set risk.
BetBugs · Set 2 WinnerwonChun Hsin TsengEstimated chance56%
Signal quality Low · Uncertainty band Slight lean · Not priced
The read
An evenly matched, fatigue-affected Davis Cup singles with Wallin's strong three-set habit in the recent window makes a decider slightly more likely than not.
- Wallin went to three sets in 8 of his last 15 matches; Tseng in roughly 5 of 15.
- Both recent-window records are close on total points won (Tseng 50.9%, Wallin 50.9%).
- Wallin's 63% career deciding-set win rate shows he regularly reaches and competes in deciders.
BetBugs · Total SetslostOver 2.5Estimated chance53%

Match stats1 of 1 landed

Signal quality Medium · Uncertainty band Strong lean · Not priced
The read
Wallin's consistently high ace rate in the recent window combined with a second server (Tseng) on hard-court bases makes the combined 5.5 ace line a strong Over even accounting for an unspecified surface.
- Recent window aces per match: Wallin 5.4 (81 aces/15) vs Tseng 3.0 (45/15) — combined average above 8.
- On clay specifically Wallin still averaged 5.6 aces per match (78/14) and Tseng 1.7 (15/9).
- Wallin is 191cm with a right-handed two-handed backhand; his recent 1st-serve points won is 71.9%.
BetBugs · Total Acesnot gradableOver 5.5Estimated chance70%
Signal quality Low · Uncertainty band Lean · Not priced
The read
Both players' recent windows show low per-set tiebreak frequency and sub-10-game average sets, so a break-driven match without a tiebreak is marginally more likely, held at low confidence given thin tiebreak samples.
- Recent window tiebreak sets: Tseng 3 of 36 sets; Wallin 3 of 38 sets, roughly 8% per set.
- Tiebreak matches in the last 15: 3 of 15 for Tseng and 3 of 15 for Wallin (about 20% each).
- Average set length below 10 games (Tseng 8.8, Wallin 9.4) reduces break-free set endings.
BetBugs · Tiebreak in MatchwonNoEstimated chance58%
Signal quality Low · Uncertainty band Slight lean · Not priced
The read
Wallin's low first-serve percentage and 2.9 double faults per match in the recent window lift the combined total just above 3.5.
- Recent window double faults per match: Wallin 2.9 (43/15) vs Tseng 1.1 (16/15) — combined average 4.0.
- Wallin's 58.6% first-serve-in percentage in the last 15 puts pressure on his second delivery.
- On clay Wallin averaged 2.7 DF/match (38/14) and Tseng 1.3 (12/9).
BetBugs · Total Double Faultsnot gradableOver 3.5Estimated chance56%

Prediction history

Chun Hsin Tseng Has Shown Modest Match-Winner Reliability With All Misses as Losses

Chun Hsin Tseng fulfilled 5 of 8 match-winner projections, just above the 4.8 expected from the average estimated probability of 59.9. His matched projections averaged 62.2, while missed projections averaged 56.0, indicating the misses came at the lower end of his tracked probability range. All three missed predictions were subject losses with no unresolved outcomes, and the current 60% estimate sits within his 52–68 historical range.

Recent evidence for Chun Hsin Tseng8 matches

Date / competitionMatch resultPredictedActualResult

22 Jun·ATP Wimbledon

#234Chun Hsin Tseng0-2#187Gustavo Heide

BetBugsChun Hsin Tseng to win·58%

Missed

22 Jun 2026

ATP Wimbledon

#234Chun Hsin Tseng0-2#187Gustavo Heide

Chun Hsin Tseng to win

58%probability

Gustavo Heide won

Missed

16 Jun·Parma - Italy

#234Chun Hsin Tseng2-0#506Juan Cruz Martin Manzano

BetBugsChun Hsin Tseng to win·68%

Matched

16 Jun 2026

Parma - Italy

#234Chun Hsin Tseng2-0#506Juan Cruz Martin Manzano

Chun Hsin Tseng to win

68%probability

Chun Hsin Tseng won

Matched

11 Jun·Bratislava - Slovakia

#312Maxim Mrva2-0#245Chun Hsin Tseng

BetBugsChun Hsin Tseng to win·58%

Missed

11 Jun 2026

Bratislava - Slovakia

#312Maxim Mrva2-0#245Chun Hsin Tseng

Chun Hsin Tseng to win

58%probability

Maxim Mrva won

Missed

3 Jun·Perugia - Italy

#181Chun Hsin Tseng1-2#189Timofey Skatov

BetBugsChun Hsin Tseng to win·52%

Missed

3 Jun 2026

Perugia - Italy

#181Chun Hsin Tseng1-2#189Timofey Skatov

Chun Hsin Tseng to win

52%probability

Timofey Skatov won

Missed

2 Jun·Perugia - Italy

#139Moez Echargui1-2#181Chun Hsin Tseng

BetBugsChun Hsin Tseng to win·65%

Matched

2 Jun 2026

Perugia - Italy

#139Moez Echargui1-2#181Chun Hsin Tseng

Chun Hsin Tseng to win

65%probability

Chun Hsin Tseng won

Matched

Chun Hsin Tseng

8W 7L

3-6 7-6(7) 6-2#398Luca Castelnuovo

6-3 7-6(1)#387Kasidit Samrej

6-3 6-3#324Fajing Sun

7-5 6-3#406Yosuke Watanuki

6-4 6-0#794Tianhui Zhang

5-7 6-3 6-0#184Jan Kumstat

6-4 6-2#353Norbert Gombos

6-2 6-4#443Oleksii Krutykh

7-5 2-6 6-1#275Juan Bautista Torres

6-4 6-1#265Hynek Barton

5-7 6-1 6-4#182Vitaliy Sachko

6-1 1-6 6-1#166Tom Gentzsch

2-6 6-3 2-0 ret.#94Alex Molcan

6-3 3-0 ret.#883Orlando Luz

7-6(8) 6-4#123Gustavo Heide

Olle Wallin

10W 5L

6-3 7-5#173Zdenek Kolar

7-6(4) 6-4#353Norbert Gombos

7-5 6-2—Matthias Ujvary

6-4 3-6 6-4#397Johan Nikles

3-6 6-1 7-6(9)#867Andrea Colombo

4-6 6-0 6-3#893Niccolo Catini

5-7 6-2 6-3#418Carlos Taberner

6-2 7-5#771Niklas Guttau

6-2 1-6 7-5—Christopher Papa

6-1 6-4#167Andrea Guerrieri

6-4 7-5#74Jan Choinski

6-3 1-6 6-1#212Roberto Carballes Baena

3-6 6-3 6-2#204Lorenzo Giustino

7-6(9) 6-3#465Matthew William Donald

4-6 6-2 6-2—Vincent Dullinger

Stat Battle

Last 15 match performance, compared side by side.

CTChun Hsin TsengTseng

Last 15

4–3

9 core stats · 2 even

Olle WallinWallinOW

Chun Hsin Tseng carries the stronger recent form — Olle Wallin's route runs through serve.

Serve · 3–2

1st Serve In64.5%+5.9pp58.6%

1st Serve Won68.3%+3.6pp71.9%

2nd Serve Won50.1%+4.3pp45.8%

Aces / Match3.0+2.45.4

Double Faults / Match1.11.8 fewer2.9

Return · 0–0 · 1 even

Return Pts Won40.5%—40.8%

Pressure · 1–1

Break Pts Converted42.1%+5.1pp37.0%

Break Pts Saved60.8%+1.9pp62.7%

Points · 0–0 · 1 even

Total Pts Won50.9%—50.9%

Serve · 3–2

64.5%1st Serve In+5.9pp58.6%

68.3%1st Serve Won+3.6pp71.9%

50.1%2nd Serve Won+4.3pp45.8%

3.0Aces / Match+2.45.4

1.1Double Faults / Match1.8 fewer2.9

Return · 0–0 · 1 even

40.5%Return Pts Won—40.8%

Pressure · 1–1

42.1%Break Pts Converted+5.1pp37.0%

60.8%Break Pts Saved+1.9pp62.7%

Points · 0–0 · 1 even

50.9%Total Pts Won—50.9%