Korea, Rep.
| Age | 15 (15-09-2010) |
| Country | Korea, Rep. |
| Birthplace | |
| Height | |
| Weight | |
| Plays | |
| Backhand | |
| Favorite Surface |  Hard |
| Coach | |
| Turned Pro | |
| Player Status | Active |
Match Stats
Hard
Clay
Grass
Indoor
All
Service Stats
| Aces / Game | 0.37 | 17 / 45 |
| DFs / Game | 0.73 | 33 / 45 |
| 1st Serve % | 45.2% | 155 / 343 |
| 1st Serve Win % | 63.9% | 99 / 155 |
| 2nd Serve Win % | 42.6% | 80 / 188 |
| Service Points Win % | 52.2% | 179 / 343 |
Return Stats
| Opponent Aces / Game | 0.02 | 1 / 45 |
| Opponent Double Faults / Game | 0.33 | 15 / 45 |
| Opponent 1st Serve % | 66.5% | 187 / 281 |
| 1st Return Win % | 39.6% | 74 / 187 |
| 2nd Return Win % | 47.9% | 45 / 94 |
| Return Points Win % | 42.3% | 119 / 281 |
Break Points (Serve)
| Break Points Saved Per Game | 0.48 | 22 / 45 |
| Break Points Faced Per Game | 0.92 | 42 / 45 |
| Break Points Save % | 52.4% | 22 / 42 |
| Service Hold % | 56.0% | 25 / 45 |
Break Points (Rtn)
| Break Points Won Per Game | 0.31 | 14 / 45 |
| Opponent Break Points Per Game | 0.44 | 20 / 45 |
| BP Won % | 70.0% | 14 / 20 |
| Opp Hold % | 69.2% | 31 / 45 |
Siyoen Sim Past Matches
 | W35 Changwon | |||||
05 May 2026 QF |  | 6 3 6 4 | L |  | H2H 0-0 | |
04 May 2026 Q2 | | 6 0 4 1 | W | H2H 0-0 | ||
03 May 2026 Q1 | | 7 5 6 4 | W | H2H 0-0 | ||
| W15 Sharm ElSheikh 4 | |||||
18 Feb 2026 R1 | JR | | 7 6 3 6 6 4 | L | | H2H 0-0 |
Siyoen Sim Surface Summary
| year | All | hard | clay | indoor | grass |
| 2026 | 2-4 | 2-4 | 0-0 | 0-0 | 0-0 |
| 2025 | 9-5 | 3-3 | 0-0 | 6-2 | 0-0 |
Siyoen Sim Performance Breakdown
Tournament Level Breakdown
| Grand Slam | 0.0% | 0 / 0 |
| Masters | 0.0% | 0 / 0 |
| Main Tour | 0.0% | 0 / 0 |
| Cups | 0.0% | 0 / 0 |
| Challengers | 66.7% | 2 / 1 |
| Futures | 52.9% | 9 / 8 |
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 | 55.0% | 11 / 9 |
| Hard | 41.7% | 5 / 7 |
| Clay | 0.0% | 0 / 0 |
| Indoor | 75.0% | 6 / 2 |
| Grass | 0.0% | 0 / 0 |
Round Breakdown
| Second | 0.0% | 0 / 1 |
| First | 25.0% | 1 / 3 |
| Qualifying Final | 20.0% | 1 / 4 |
| Qualifying R2 | 100.0% | 5 / 0 |
| Qualifying R1 | 80.0% | 4 / 1 |
Siyoen Sim Titles/Finals/Semis 
Title
Finals
Siyoen Sim interesting Heads to Heads
 Siyoen Sim | Draw VIEW H2H |  Amra Sadikovic | ||
Siyoen Sim | Draw VIEW H2H |  Ho Ching Wu | ||
Siyoen Sim | Draw VIEW H2H |  Dabin Kim | ||
Siyoen Sim | Draw VIEW H2H |  Eunyeong Park | ||
Siyoen Sim | Draw VIEW H2H |  Hania Abouelsaad | ||
Siyoen Sim | Draw VIEW H2H |  A Young Jang | ||
Siyoen Sim | Draw VIEW H2H |  Nalu Himeno | ||
Siyoen Sim | Draw VIEW H2H |  Jiyoung Seo | ||
Siyoen Sim | Draw VIEW H2H |  Ksenia Meshcheryakova | ||
Siyoen Sim | Draw VIEW H2H |  Elsa Wan | ||
Siyoen Sim | Draw VIEW H2H |  Xinxin Yao | ||
Siyoen Sim | Draw VIEW H2H |  Anne Christine Lutkemeyer Obregon | ||
Upcoming Tennis Predictions & Head to Heads
Serban Rozhkova Prediction H2H (0-0)
Iancu Kushnir Prediction H2H (0-0)
Bejlek Navarro Prediction H2H (0-3)
Keles Isaacs Prediction H2H (0-0)
Dart Boulter Prediction H2H (2-6)
Alvisi Bonaccorso Prediction H2H (0-0)
Jazmin Ortenzi Francesca Pace Prediction H2H (0-0)
 ATP Rankings | |||
|---|---|---|---|
| 1 | 13500 PTS | ||
| 2 | 9960 PTS | ||
| 3 | 7305 PTS | ||
| 4 | 4440 PTS | ||
| 5 | 3920 PTS | ||
| 6 | 3905 PTS | ||
| 7 | 3760 PTS | ||
| 8 | 3760 PTS | ||
| 9 | 3720 PTS | ||
| 10 | 3540 PTS | ||
 Live Tennis Events | |||
|---|---|---|---|
 | HSBC Championships - London Great Britain | ||
 | Terra Wortmann Open - Halle Germany | ||
 | Asuncion Challenger Paraguay | ||
 | Cattolica Challenger Italy | ||
 | Dublin Challenger Ireland | ||
| Nottingham 2 Challenger Great Britain | ||
| Parma Challenger Italy | ||
 | Poznan Challenger Poland | ||
 | Royan Challenger France | ||
 | San Miguel de Tucuman Challenger Argentina | ||
| M15 Bourg-en-Bresse France | ||
 | M15 Constanta Romania | ||
 | M15 Gyula Hungary | ||
 | M15 Kayseri Turkey | ||
 | M15 Kursumlijska Banja Serbia | ||
 | M15 Los Angeles United States | ||
 | M15 Maanshan China | ||
 | M15 Monastir Tunisia | ||
 | M15 Mungia-Laukariz Spain | ||
| M15 Saarlouis Germany | ||
 | M15 Tokyo Japan | ||
 | M25 Klosters Switzerland | ||
 | M25 Lourinha Portugal | ||
| M25 Milano Italy | ||
 | M25 Samobor Croatia | ||
| M25 Wichita United States | ||
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