Great Britain
| Age | 21 (06-12-2004) |
| Country | Great Britain |
| Birthplace | London |
| Height | 188 |
| Weight | 83 |
| Plays | Left-Handed |
| Backhand | Two-Handed |
| Favorite Surface |  Hard |
| Coach | David Felgate |
| Turned Pro | |
| Player Status | Active |
Match Stats
Hard
Clay
Grass
Indoor
All
Service Stats
| Aces / Game | 0.33 | 13 / 39 |
| DFs / Game | 0.41 | 16 / 39 |
| 1st Serve % | 69.5% | 166 / 239 |
| 1st Serve Win % | 67.5% | 112 / 166 |
| 2nd Serve Win % | 45.2% | 33 / 73 |
| Service Points Win % | 60.7% | 145 / 239 |
Return Stats
| Opponent Aces / Game | 0.31 | 12 / 39 |
| Opponent Double Faults / Game | 0.33 | 13 / 39 |
| Opponent 1st Serve % | 66.1% | 146 / 221 |
| 1st Return Win % | 17.8% | 26 / 146 |
| 2nd Return Win % | 50.7% | 38 / 75 |
| Return Points Win % | 29.0% | 64 / 221 |
Break Points (Serve)
| Break Points Saved Per Game | 0.31 | 12 / 39 |
| Break Points Faced Per Game | 0.56 | 22 / 39 |
| Break Points Save % | 54.5% | 12 / 22 |
| Service Hold % | 74.4% | 29 / 39 |
Break Points (Rtn)
| Break Points Won Per Game | 0.13 | 5 / 39 |
| Opponent Break Points Per Game | 0.38 | 15 / 39 |
| BP Won % | 33.3% | 5 / 15 |
| Opp Hold % | 87.2% | 34 / 39 |
William Jansen Past Matches
 | M15 Kayseri | |||||
23 Jun 2026 R1 |  | 6 2 5 7 6 2 | L |  | H2H 0-0 | |
 | Nottingham 2 Challenger | |||||
13 Jun 2026 Q1 | | 7 5 2 6 7 6 | L | | H2H 0-0 | |
| Birmingham Challenger | |||||
31 May 2026 Q1 | | 6 1 6 4 | L | | H2H 0-0 | |
 | M25 Columbus 1 | |||||
13 Nov 2025 R2 | | 6 3 6 4 | L | | H2H 0-0 | |
William Jansen Surface Summary
| year | All | hard | clay | indoor | grass |
| 2026 | 0-3 | 0-1 | 0-0 | 0-0 | 0-2 |
| 2025 | 9-7 | 2-3 | 0-0 | 7-3 | 0-1 |
| 2024 | 14-7 | 12-4 | 0-0 | 2-2 | 0-1 |
| 2023 | 6-7 | 5-5 | 0-0 | 0-0 | 1-2 |
| 2022 | 11-12 | 9-9 | 0-0 | 0-0 | 2-3 |
| 2021 | 0-1 | 0-0 | 0-0 | 0-0 | 0-1 |
William Jansen Performance Breakdown
Tournament Level Breakdown
| Grand Slam | 0.0% | 0 / 1 |
| Masters | 0.0% | 0 / 0 |
| Main Tour | 0.0% | 0 / 0 |
| Cups | 0.0% | 0 / 0 |
| Challengers | 0.0% | 0 / 7 |
| Futures | 58.0% | 40 / 29 |
Opponent Rank Breakdown
| Vs No.1 | 0.0% | 0 / 0 |
| Vs Top.5 | 0.0% | 0 / 0 |
| Vs Top.10 | 0.0% | 0 / 0 |
| Vs Top.20 | 0.0% | 0 / 0 |
| Vs Top.50 | 0.0% | 0 / 0 |
| Vs Top.100 | 0.0% | 0 / 0 |
Surface Breakdown
| Overall | 50.0% | 36 / 36 |
| Hard | 56.0% | 28 / 22 |
| Clay | 0.0% | 0 / 0 |
| Indoor | 55.6% | 5 / 4 |
| Grass | 23.1% | 3 / 10 |
Round Breakdown
| Semi-Final | 0.0% | 0 / 1 |
| Quarter-Final | 14.3% | 1 / 6 |
| Second | 43.8% | 7 / 9 |
| First | 57.1% | 16 / 12 |
| Qualifying Final | 75.0% | 6 / 2 |
| Qualifying R2 | 100.0% | 2 / 0 |
| Qualifying R1 | 53.3% | 8 / 7 |
William Jansen Titles/Finals/Semis 
Title
Finals
William Jansen interesting Heads to Heads
 William Jansen | Draw VIEW H2H |  Yannick Mertens | ||
William Jansen | Draw VIEW H2H |  Alex Bolt | ||
William Jansen | Draw VIEW H2H |  Thai Kwiatkowski | ||
William Jansen | Draw VIEW H2H |  Goncalo Oliveira | ||
William Jansen | Draw VIEW H2H |  Billy Harris | ||
William Jansen | Draw VIEW H2H |  Julian Cash | ||
William Jansen | Draw VIEW H2H |  Francesco Ferrari | ||
William Jansen | Draw VIEW H2H |  Nathan Ponwith | ||
William Jansen | Draw VIEW H2H |  Daniel Little | ||
William Jansen | Draw VIEW H2H |  Johannes Ingildsen | ||
William Jansen | Draw VIEW H2H |  Remy Bertola | ||
William Jansen | Draw VIEW H2H |  Daniel Cox | ||
Upcoming Tennis Predictions & Head to Heads
Trongcharoenchaikul Butulija Prediction H2H (0-0)
Sinner Borges Prediction H2H (1-0)
Cerny Angeloni Prediction H2H (0-0)
Exsted Berger Prediction H2H (0-0)
Wolf Friend Prediction H2H (0-0)
Barun Sakellaridis Prediction H2H (0-0)
Jakub Mensik Toby Samuel Prediction H2H (0-0)
 ATP Rankings | |||
|---|---|---|---|
| 1 | 13450 PTS | ||
| 2 | 9460 PTS | ||
| 3 | 7190 PTS | ||
| 4 | 4390 PTS | ||
| 5 | 4160 PTS | ||
| 6 | 4110 PTS | ||
| 7 | 3765 PTS | ||
| 8 | 3760 PTS | ||
| 9 | 3580 PTS | ||
| 10 | 3460 PTS | ||
 Live Tennis Events | |||
|---|---|---|---|
 | Wimbledon - London Great Britain | ||
 | Brasov Challenger Romania | ||
 | Cary Challenger United States | ||
 | Milan Challenger Italy | ||
 | Quito Challenger Ecuador | ||
 | Troyes Challenger France | ||
 | M15 Getxo Spain | ||
 | M15 Hillcrest South Africa | ||
 | M15 Kayseri Turkey | ||
 | M15 Kursumlijska Banja Serbia | ||
 | M15 Monastir Tunisia | ||
 | M15 Store Slovenia | ||
 | M15 Umag Croatia | ||
 | M15 Wuning China | ||
| M25 Ajaccio France | ||
 | M25 Figueira da Foz Portugal | ||
 | M25 Marburg Germany | ||
 | M25 Nivelles Belgium | ||
 | M25 Rabat Morocco | ||
 | M25 Skopje FYR Macedonia | ||
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