RallyIQ

WTA · Right-handed · 12 charted matches · 2025–2026

Janice Tjen

Archetype: Runs around the backhand · Forehand-dominant

Against an average opponent

Serve points won 58.3% ±3.7 raw 57.3% · tour 56.3% · 649 points
Return points won 41.8% ±3.6 raw 39.9% · tour 43.7% · 714 points

Serve and return points won, refitted against every opponent at once so a record built on weak or strong opposition is put on the same scale. Career, all surfaces, with a 90% margin. Raw is the plain share of points won.

Value per 100 shots

Direction choice +0.21 ±0.15 better than 86% of WTA · raw +0.22
Shot selection −1.19 ±0.31 better than 3% of WTA · raw −1.18
Execution −0.18 ±0.89 better than 53% of WTA · raw −0.07
Tactical adaptability +0.03 first serves toward what's working, set to set · 12 matches
Adaptation speed +0.01 same, every two to three service games · per 100 first serves
Points left on the table 2.89 per 100 shots vs best direction · lower than 17% of WTA

Points gained per 100 shots compared with an average tour player in the same position, adjusted for the strength of the opponents faced, with a 90% margin (shots clustered by match). Raw is before the opponent adjustment. Built on 3,592 shots.

Shot expected value

The share of points Janice Tjen goes on to win after each option in the positions they face most often, shrunk toward tour average when the sample is small. Showing the 8 most-used options; teal marks the best one with at least 30 shots.

Rally, shots 5–8: drive to your backhand side

position worth 45% to the average player · 308 shots

OptionUsedWin %Tour
BH slice crosscourt 40% 38.8%±6.7 40.4%
BH slice through the middle 24% 24.6%±7.3 34.4%
FH inside-out 10% 44.1%±11.4 52.5%
FH inside-in 10% 63.0%±11.1 55.6%
BH slice down the line 8% 34.9%±11.8 31.7%
FH through the middle 5% 41.7%±13.5 45.1%

Rally, shots 5–8: drive to your middle

position worth 50% to the average player · 179 shots

OptionUsedWin %Tour
FH crosscourt 33% 62.7%±8.9 52.7%
FH down the line 28% 52.7%±9.7 52.2%
FH through the middle 25% 47.9%±10.2 45.8%

Rally, shots 5–8: drive to your forehand side

position worth 43% to the average player · 137 shots

OptionUsedWin %Tour
FH crosscourt 50% 43.1%±8.6 46.7%
FH down the line 27% 47.3%±10.9 44.9%
FH through the middle 17% 42.5%±12.4 41.3%

Return +1: drive to your backhand side

position worth 44% to the average player · 135 shots

OptionUsedWin %Tour
BH slice crosscourt 37% 45.6%±9.8 39.6%
BH slice through the middle 33% 27.6%±9.2 33.2%
FH inside-out 13% 44.9%±13.3 55.4%

Serve under pressure

Pressure predictability index ±0 How much less varied Janice Tjen's first-serve direction gets on break points. Positive means easier to read. Based on 70 break-point first serves.

Deuce court

1st serveUsageBreak ptWon when in
Wide 50% 47% 62% / 66%
Body 6% 21% ▲ 56% / 57%
T 44% 32% ▼ 74% / 68%

324 normal · 19 break-point 1st serves

Ad court

1st serveUsageBreak ptWon when in
Wide 42% 41% 62% / 66%
Body 6% 4% 63% / 56%
T 52% 55% 60% / 64%

252 normal · 51 break-point 1st serves

Is the serve mix in equilibrium?

Game theory says a well-mixed server wins equally often with every direction they use. If one direction wins more, it's underused and points are being left behind. This is the minimax test Walker and Wooders ran on Wimbledon finals, applied to every charted first serve. Win rates include faults. "Optimal" allows for returners reading a habit. A direction loses 0.19 points per 100 serves for every 10 points of habitual usage, measured from WTA servers whose mix drifted between matches. Shifts stay within the range servers' habits actually vary, the only range that response was measured over.

Deuce court

1st serveUsagePoints wonOptimal
Wide50% 57.4%±5.7 n=171 42% ▼
Body7% 51.5%±11.1 n=25 0% ▼
T43% 62.1%±6.0 n=147 58% ▲

Consistent with an optimal mix (p = 0.13).
Optimal mix: +0.4 per 100 first serves.

Ad court

1st serveUsagePoints wonOptimal
Wide42% 53.9%±6.6 n=126 49% ▲
Body6% 62.2%±11.5 n=18 0% ▼
T52% 57.0%±5.9 n=159 51% ▼

Consistent with an optimal mix (p = 0.25).
Optimal mix: +0.1 per 100 first serves.

Exploitability 0.28 points per 100 first serves What the optimal mix would win over the current one, both courts. More exploitable than 100% of WTA servers. Tested on matches they weren't fitted on, WTA mixes picked this way win 0.42 per 100 first serves on average.

Repeating the previous direction to the same court: −4.8±6.3 points per 100 against switching. Negative means returners read repeats. Tour-wide, repeating costs women about 0.4 points per 100 and costs men nothing, so men's returners don't measurably anticipate direction. (262 repeats, 360 switches.)

Return by serve direction

Return points won against each serve direction, compared with the tour average.

ServeCourtDirectionPointsWonvs tour
1stAd courtBody 50 38% −6.2±8.9
1stAd courtT 82 30% −5.5±7.1
1stAd courtWide 116 30% −4.1±6.3
1stDeuce courtBody 59 47% +4.3±8.7
1stDeuce courtT 89 34% +2.0±7.2
1stDeuce courtWide 89 30% −4.4±6.9
2ndAd courtBody 38 61% +6.0±9.7
2ndAd courtT 27 55% +0.2±10.8
2ndAd courtWide 31 49% −4.3±10.5
2ndDeuce courtBody 54 59% +4.3±8.8
2ndDeuce courtT 41 50% −5.6±9.8
2ndDeuce courtWide 38 53% −0.6±10.0

Signature patterns

Recurring sequences that win more than Janice Tjen's own baseline, ranked by edge weighted by how often they're used.

Serve → +1

  1. T serve (ad court) → FH crosscourt used 4.9% · won 65% · +1.2±11.1 vs own baseline
  2. Wide serve (ad court) → FH crosscourt used 5.6% · won 63% · −0.6±10.8 vs own baseline
  3. T serve (deuce court) → FH down the line used 4.9% · won 63% · −0.8±11.2 vs own baseline
  4. Wide serve (deuce court) → FH crosscourt used 6.5% · won 62% · −1.5±10.5 vs own baseline
  5. Wide serve (deuce court) → FH through the middle used 6.5% · won 61% · −3.2±10.5 vs own baseline

Return

  1. vs wide serve (deuce court) → FH crosscourt, mid used 10.3% · won 50% · +11.7±10.8 vs own baseline

Rally, consecutive own shots

  1. FH crosscourt → FH down the line used 8.0% · won 49% · +7.5±9.7 vs own baseline
  2. FH crosscourt → BH slice crosscourt used 4.2% · won 48% · +6.3±11.6 vs own baseline
  3. BH slice crosscourt → BH slice crosscourt used 7.6% · won 42% · +0.2±9.7 vs own baseline
  4. FH crosscourt → FH crosscourt used 5.8% · won 42% · −0.2±10.5 vs own baseline
  5. FH through the middle → BH slice crosscourt used 4.2% · won 40% · −1.5±11.4 vs own baseline

Discovered sequences

Mined from every me → opponent → me run of three shots, with no templates. Ranked by how much more often Janice Tjen wins the point once the sequence happens, weighted by how often it happens. Think of them as chess openings.

  1. FH down the line → BH through the middle → FH crosscourt used 1.1% · won 60% · +14.6±12.2 vs own baseline · +21.9 vs tour on the same sequence
  2. FH down the line → BH crosscourt → BH slice crosscourt used 1.0% · won 51% · +5.5±12.7 vs own baseline · +17.4 vs tour on the same sequence Disrupted by Mia Pohankova (5/7)
  3. FH crosscourt → FH crosscourt → FH down the line used 1.7% · won 49% · +3.5±11.2 vs own baseline · +4.0 vs tour on the same sequence Disrupted by Yidi Yang (5/11), Daria Kasatkina (3/6)
  4. FH through the middle → FH down the line → BH slice crosscourt used 1.1% · won 45% · −0.3±12.5 vs own baseline · +6.3 vs tour on the same sequence Disrupted by Mirra Andreeva (3/8)
  5. FH crosscourt → FH down the line → BH slice crosscourt used 1.1% · won 45% · −0.3±12.5 vs own baseline · +4.6 vs tour on the same sequence
  6. BH slice crosscourt → BH crosscourt → BH slice down the line used 1.1% · won 40% · −5.0±12.3 vs own baseline · −9.2 vs tour on the same sequence

Strengths and vulnerabilities

Value per 100 shots compared with the average player hitting (strengths) or facing (vulnerabilities) the same shot. Only shot types seen at least 120 times.

Hurts opponents most with

FH to the middle · return+1.5172
BH slice to the middle · rally+1.2132
FH to their backhand · rally+1.1242
Wide 1st serve · ad court+0.7126
BH slice to their backhand · rally+0.6192

Most exposed to

FH to the middle · return−1.7138
Wide 1st serve · ad court−1.6161
T 1st serve · deuce court−0.4151
BH to the middle · return−0.2140
FH to their backhand · rally+0.1218

Active players who are best at the shot in the top weakness: Elina Avanesyan, Caroline Wozniacki, Sara Sorribes Tormo, Lin Zhu, Qiang Wang

Tactical fingerprint

Each bar shows how far a style trait is from the WTA average, in standard deviations.

BH down the line47%
Backhand slice90%
Run-around forehands37%
Forehand share66%
Chipped returns29%
T serves · ad52%
Wide serves · deuce50%
T serves · deuce43%
Deep returns37%
Avg rally length4.2
Points at net8%
Wide serves · ad42%
Point-ending shots24.3%
Unforced errors / shot10.7%
Serve & volley0%
1st serve in61%
FH down the line27%
Drop shots / shot0.6%
Through the middle24%

Plays most like

  1. Samantha Stosur 2009–2022 plan v
  2. Diane Parry 2021–2026 plan v
  3. Daria Saville 2015–2024 plan v
  4. Ashleigh Barty 2013–2022 plan v
  5. Harriet Dart 2018–2025 plan v
  6. Ana Ivanovic 2007–2016 plan v
  7. Francesca Schiavone 2006–2017 plan v
  8. Karolina Muchova 2019–2026 plan v

Closest from another era

  1. Steffi Graf 1985–1999
  2. Nadia Petrova 2005–2013
  3. Daniela Hantuchova 2002–2015

Charted matches