MexicoWTA MonterreyFinished

Predictions graded

Janice Tjen #372Dayana Yastremska #87Ukraine1

Sets 2-6 · 6-3 · 7-6Mon 24 Aug 2026, 22:40 Predictions gradedFirst RoundHard

Predictions3–260%

Edges1–150%

Player Profiles

Ranking advantageJanice Tjen · 50 places

Janice Tjen

Indonesian player born 6 May 2002. She reached a career-high singles ranking of No. 36 on 23 February 2026; the official ITF profile lists a 2026 record of 9-9 on hard courts, without establishing a declared preferred surface.

Current ranking: #37
Peak ranking: #36 · 2026
Current age: 24
Preferred surface: —
Hand: Right handed
Height: 171 cm

Dayana Yastremska

Ukraine

Yastremska reached a career-high No. 21 in January 2020. ITF lists hard courts as her preferred surface.

Current ranking: #87
Peak ranking: #21 · 2020
Current age: 26
Preferred surface: Hard
Hand: Right handed
Height: 175 cm

Quick Take

Pre-match view

Context last updated 23 Aug 2026, 16:10 · Europe/Bucharest

Janice Tjen is favored over Dayana Yastremska based on a dominant H2H win, higher ranking, and Yastremska's shoulder concerns and poor recent hard-court form.

The betting line on Tjen offers no value, but Yastremska is a risky pick given her surface struggles. Best angles are Tjen to win the first set if odds improve or over 5.5 total aces.

Context

Intel: 'Shoulder rehabilitation announced in July' - after Wimbledon, Yastremska said a shoulder issue required medication and a rehabilitation break.
- Her only recent hard-court match was a 6-1 6-2 loss to Tatjana Maria on Aug 13, 2026.
- In that match, she won only 50% of first-serve points and 20% of games.
- No current source confirms the shoulder is fully healed.
Last-15 hard-court record: 0-1, with 3 games won out of 15 (20%).
- First-serve points won on hard: 50% (1 match), compared to 59.7% overall in last 15.
- Return points won on hard: 28.9% (1 match), compared to 45.1% overall.
- Sample size is only one match, but the drop is severe.
Last-15 hard-court record: 2-3 (40%), with 49.6% games won.
- First-serve points won on hard: 66% (5 matches).
- Aces per match on hard: 4.6 (5 matches).
- Recent hard-court losses were to top-50 opponents (Andreeva, Samsonova, Kalinskaya).
H2H: Tjen won 6-4 6-1 on hard court on Feb 15, 2026.
- Tjen won 78% of first-serve points and 68% of second-serve points.
- Yastremska won only 27% of return points and 27% of second-serve points.
- Yastremska had 7 double faults in that match.

BetBugs edges

Compare BetBugs' chances with the market's.

Other edges · 2

The published chance does not exceed the market's implied chance.

Match WinnerwonUncertainty band: Lean

Janice Tjen

1.55fair 1.61

BetBugs 62% · Market 64.5%

0.0ppshort

Tjen's dominant H2H win, higher ranking, and Yastremska's shoulder concern and poor recent hard-court sample give Tjen a clear edge, though Yastremska's overall last-15 record keeps confidence medium.

Set 1 WinnerlostUncertainty band: Lean

Janice Tjen

1.55fair 1.67

BetBugs 60% · Market 64.5%

0.0ppshort

Tjen's stronger serve metrics on hard and H2H first-set win support her taking the opener, but the odds imply a higher probability than the model estimate.

BetBugs probabilities

How likely BetBugs thought each outcome was.

Result1 of 1 landed

Signal quality Medium · Uncertainty band Lean · Market price 1.55
The read
Tjen's dominant H2H win, higher ranking, and Yastremska's shoulder concern and poor recent hard-court sample give Tjen a clear edge, though Yastremska's overall last-15 record (8-7) keeps confidence medium.
- Tjen won the only H2H meeting 6-4 6-1 on hard in Feb 2026, with 78% first-serve points won vs Yastremska's 27% return points won.
- Tjen's last-15 hard-court record is 2-3 (40%) with 49.6% games won, while Yastremska's only recent hard match was a 6-1 6-2 loss to Tatjana Maria.
- Yastremska has a shoulder rehabilitation note from July 2026 and has not played a hard-court match since that loss on Aug 13, 2026.
- Tjen is ranked 37 vs Yastremska's 107, and Tjen's career hard-court win percentage is 119-? (surfaceWins 119) vs Yastremska's 120-? but Yastremska's recent hard form is absent.
BetBugs · Match WinnerwonJanice TjenEstimated chance62%

Games1 of 2 landed

Signal quality Low · Uncertainty band Slight lean · Not priced
The read
Both players' recent match lengths average over 23 games, and their comparable games-won percentages indicate a likely close contest, but the H2H was one-sided, so confidence is low.
- Tjen's last-15 matches average 23.7 games per match (355 games / 15 matches).
- Yastremska's last-15 matches average 24.3 games per match (364 games / 15 matches).
- Both players have similar games-won percentages around 46-50%, suggesting competitive sets.
BetBugs · Total GameswonOver 20.5Estimated chance55%
Signal quality Low · Uncertainty band Slight lean · Not priced
The read
Both players tend to play competitive first sets, and the H2H first set went to 10 games, but the low confidence reflects the possibility of a quick set given Yastremska's hard-court struggles.
- Tjen's last-15 first sets include several 7-6 and 6-4 scores, with an average first-set games around 9.8.
- Yastremska's recent first sets include 7-6, 6-4, and 6-3 scores, averaging around 9.5 games.
- The H2H first set was 6-4 (10 games).
BetBugs · Set 1 Total GameslostOver 9.5Estimated chance52%

Sets0 of 1 landed

Signal quality Medium · Uncertainty band Lean · Market price 1.55
The read
Tjen's stronger serve metrics on hard and H2H first-set win support her taking the opener, though Yastremska's overall competitiveness keeps it at 60%.
- Tjen won the first set 6-4 in their only H2H meeting.
- Tjen's last-15 first-serve points won is 65.5% overall and 66% on hard, while Yastremska's is 59.7% overall and 50% in her one hard match.
- Yastremska's first-set conversion rate is 83% career, but her recent hard-court first set was lost 1-6 to Maria.
BetBugs · Set 1 WinnerlostJanice TjenEstimated chance60%

Match stats0 of 0 landed

Signal quality Low · Uncertainty band Slight lean · Not priced
The read
Tjen's hard-court ace rate and Yastremska's career ace ability suggest a combined total above 5.5, but Yastremska's recent low ace count and possible shoulder issue add uncertainty.
- Tjen averages 3.3 aces per match in last 15, and 4.6 on hard in last 5 hard matches.
- Yastremska averages 1.6 aces per match in last 15, but her career ace rate is higher (1448 aces in 499 matches ≈ 2.9 per match).
- Combined expected aces: Tjen 3-4 + Yastremska 2-3 = 5-7, with hard court favoring aces.
BetBugs · Total Acesnot gradableOver 5.5Estimated chance55%
Signal quality Low · Uncertainty band Slight lean · Not priced
The read
Both players average nearly 4 double faults per match, and the hard-court surface plus Yastremska's shoulder concern could push the total over 6.5, but variance is high.
- Tjen averages 3.7 double faults per match in last 15, and 4.8 on hard in last 5 hard matches.
- Yastremska averages 3.7 double faults per match in last 15, and 4.0 in her one hard match.
- Combined expected double faults: 3.7 + 3.7 = 7.4, with hard court and pressure likely increasing errors.
BetBugs · Total Double Faultsnot gradableOver 6.5Estimated chance52%

Prediction history

Janice Tjen has been moderately reliable when projected to win

Janice Tjen has fulfilled 3 of 6 recent win projections. Her average estimated probability was 61.3%, but she won only 50% of those matches, below the expected 3.7 wins. All three misses were losses, with no draws or wins by the opponent.

Recent evidence for Janice Tjen6 matches

Date / competitionMatch resultPredictedActualResult

1 Jul·WTA Wimbledon

#42Janice Tjen1-2#65Daria Kasatkina

BetBugsJanice Tjen to win·55%

Missed

1 Jul 2026

WTA Wimbledon

#42Janice Tjen1-2#65Daria Kasatkina

Janice Tjen to win

55%probability

Daria Kasatkina won

Missed

29 Jun·WTA Wimbledon

#23Leylah Fernandez0-2#41Janice Tjen

BetBugsJanice Tjen to win·62%

Matched

29 Jun 2026

WTA Wimbledon

#23Leylah Fernandez0-2#41Janice Tjen

Janice Tjen to win

62%probability

Janice Tjen won

Matched

9 Jun·WTA 's-Hertogenbosch

#164Greet Minnen2-0#40Janice Tjen

BetBugsJanice Tjen to win·62%

Missed

9 Jun 2026

WTA 's-Hertogenbosch

#164Greet Minnen2-0#40Janice Tjen

Janice Tjen to win

62%probability

Greet Minnen won

Missed

4 Jun·WTA Birmingham

#120Ashlyn Krueger2-0#40Janice Tjen

BetBugsJanice Tjen to win·62%

Missed

4 Jun 2026

WTA Birmingham

#120Ashlyn Krueger2-0#40Janice Tjen

Janice Tjen to win

62%probability

Ashlyn Krueger won

Missed

2 Jun·WTA Birmingham

#186Nao Hibino1-2#40Janice Tjen

BetBugsJanice Tjen to win·65%

Matched

2 Jun 2026

WTA Birmingham

#186Nao Hibino1-2#40Janice Tjen

Janice Tjen to win

65%probability

Janice Tjen won

Matched

Head-to-Head

1-0 (1 meetings)

W6-4 6-1Janice Tjen#37vDayana Yastremska#107Feb 15, 2026

1 total meetings

Previous match context available

Janice Tjen

5W 10L

6-1 7-6(5)#6Mirra Andreeva

7-6(8) 5-7 7-5#52Viktorija Golubic

7-6(9) 7-5#43Liudmila Samsonova

1-6 6-3 7-6(7)#21Anna Kalinskaya

6-4 6-2#128Rebecca Sramkova

6-7(5) 6-1 6-4#68Daria Kasatkina

6-1 7-6(3)#31Leylah Annie Fernandez

7-5 6-7(5) 6-3#70Caty McNally

6-3 6-2#80Tatjana Maria

7-6(4) 6-1#178Greetje Minnen

6-1 6-3#56Ashlyn Krueger

6-4 3-6 6-2#225Nao Hibino

6-4 6-3#28Emma Navarro

6-3 3-6 6-0#55Maria Camila Osorio Serrano

6-1 7-5#243Caijsa Wilda Hennemann

Dayana Yastremska

8W 7L

6-1 6-2#80Tatjana Maria

6-3 6-7(1) 6-2#90Jessica Bouzas Maneiro

7-6(1) 4-6 7-5#289Aoi Ito

6-1 6-2#80Tatjana Maria

6-4 7-6(2)#226Alicia Dudeney

4-6 6-4 7-5#93Ajla Tomljanovic

6-1 6-2#35Sara Bejlek

7-5 6-3#15Jasmine Paolini

6-3 6-3#26Barbora Krejcikova

7-6(5) 6-7(4) 7-6(5)#90Jessica Bouzas Maneiro

6-3 7-5#86Solana Sierra

6-3 6-2#82Hanne Vandewinkel

7-6(3) 6-3#321Victoria Bosio

4-6 7-5 7-6(6)#91Anastasia Zakharova

7-6(10) 7-6(8)#86Solana Sierra

Stat Battle

Last 15 match performance, compared side by side.

JTJanice TjenTjen

Last 15

4–3

9 core stats · 2 even

Dayana YastremskaYastremskaDY

Janice Tjen carries the stronger recent form — Dayana Yastremska's route runs through pressure.

Serve · 3–1 · 1 even

1st Serve In61.5%+1.5pp63.0%

1st Serve Won65.5%+5.8pp59.7%

2nd Serve Won46.6%+1.3pp45.3%

Aces / Match3.3+1.71.6

Double Faults / Match3.7—3.7

Return · 0–1

Return Pts Won39.9%+5.2pp45.1%

Pressure · 1–1

Break Pts Converted34.5%+5.7pp40.2%

Break Pts Saved53.2%+3.9pp49.3%

Points · 0–0 · 1 even

Total Pts Won48.9%—49.6%

Serve · 3–1 · 1 even

61.5%1st Serve In+1.5pp63.0%

65.5%1st Serve Won+5.8pp59.7%

46.6%2nd Serve Won+1.3pp45.3%

3.3Aces / Match+1.71.6

3.7Double Faults / Match—3.7

Return · 0–1

39.9%Return Pts Won+5.2pp45.1%

Pressure · 1–1

34.5%Break Pts Converted+5.7pp40.2%

53.2%Break Pts Saved+3.9pp49.3%

Points · 0–0 · 1 even

48.9%Total Pts Won—49.6%