Semi-final previews from the Seoul Challenger (hard), with form, serve and return numbers and a full Tale of the Tape for every match. Times are as listed by the tournament schedule and may move with the order of play.
Chak Lam Coleman Wong vs Omar Jasika
🧠 Form & Context
Chak Lam Coleman Wong
- 🔥 Ranked No. 87 at 22, 7–3 in his last 10, through after beating Shimabukuro.
- 🚀 The bigger first serve: 72.1% of points won, and 76% in recent matches.
- 🔒 Has saved 64% of break points in recent matches.
- 🏆 Wins 60% of tiebreaks over his career.
- ⚠️ Converts only 39.7% of his break points and wins 49.6% behind his second serve.
Omar Jasika
- 🔥 Ranked No. 386 at 29, left-handed, 7–3 in his last 10, through after beating Chung.
- 🎯 Lands a high 68.5% of first serves.
- 🔁 The clearly better returner: 33.6% against the first serve and 53.4% against the second.
- 🎯 Converts 44.9% of his break points, and 47% in recent matches.
- ⚠️ Wins only 66.1% behind his first serve.
🔍 Match Breakdown
A first meeting. Wong is a heavy 1.16 favourite, ranked about 300 places above his opponent. Both are 7–3 in their last 10.
Wong has the bigger first serve (72.1% vs 66.1%), but Jasika lands far more of them (68.5% vs 60.2%) and is stronger behind the second serve (51.3% vs 49.6%). On break points saved they are level.
Jasika is the clearly better returner. He wins 33.6% of points against the first serve to 30.4%, and 53.4% against the second to 49.6%. He also converts far more break points (44.9% vs 39.7%).
Jasika has won more of his recent matches (69% vs 63%) and has the better best-of-three record (62% vs 56%). Wong has the better tiebreak record (60% vs 57%).
Wong's ranking and serve explain the price. Jasika's return game and form suggest he can make this much closer than 1.16 suggests.
📊 Tale of the Tape
| Metric | Wong | Jasika |
|---|---|---|
| Ranking | 87 | 386 |
| Age | 22 | 29 |
| Last 10 | 7–3 | 7–3 |
| Head-to-head | 0 | 0 |
| First serves in | 60.2% | 68.5% |
| 1st-serve points won | 72.1% | 66.1% |
| 2nd-serve points won | 49.6% | 51.3% |
| Break points saved | 59.7% | 59.8% |
| Break points converted | 39.7% | 44.9% |
| Return points won (career) | 38% | 41% |
| Tiebreak win % | 60% | 57% |
| Deciding-set win % (career) | 53% | 52% |
| Best-of-3 win % | 56% | 62% |
Billy Harris vs Terence Atmane
🧠 Form & Context
Billy Harris
- 📊 Ranked No. 252 at 31, 4–6 in his last 10, through after beating Sakamoto.
- 🔁 The better returner: 31.5% against the first serve and 51.5% against the second.
- 🎯 Lands 61.0% of first serves.
- 🏆 Has won 55% of deciding sets over his career.
- ⚠️ Wins only 48% of tiebreaks and 36% of deciding sets this season.
Terence Atmane
- 📊 Ranked No. 90 at 24, left-handed, 5–5 in his last 10, through after beating Hong.
- 🚀 A big first serve: 72.5% of points won, and 75% in recent matches.
- 🔒 Saves 63.4% of break points, and 66% in recent matches.
- 🏆 Wins 58% of tiebreaks over his career.
- ⚠️ Weak on return: 29.4% against the first serve.
🔍 Match Breakdown
Atmane is the 1.30 favourite and won their only previous meeting, 2–6 6–3 6–4 on clay in Oeiras in 2024.
Atmane is the stronger server. He wins more behind both serves (72.5% vs 70.2% and 52.0% vs 49.2%) and saves more break points (63.4% vs 60.3%).
Harris is the better returner, with 31.5% vs 29.4% against the first serve and 51.5% vs 49.6% against the second. On break points converted they are level (about 42%).
Neither arrives in great form (4–6 vs 5–5 in the last 10), and their recent win rates are almost identical (45% vs 43%). Atmane has the much better tiebreak record (58% vs 48%).
Expect plenty of holds. Atmane's serve and tiebreak record make him the favourite. Harris, who knocked out Sakamoto in the quarter-finals, needs his return game to keep it close.
📊 Tale of the Tape
| Metric | B. Harris | Atmane |
|---|---|---|
| Ranking | 252 | 90 |
| Age | 31 | 24 |
| Last 10 | 4–6 | 5–5 |
| Head-to-head | 0 | 1 |
| First serves in | 61.0% | 59.8% |
| 1st-serve points won | 70.2% | 72.5% |
| 2nd-serve points won | 49.2% | 52.0% |
| Break points saved | 60.3% | 63.4% |
| Break points converted | 42.3% | 42.2% |
| Return points won (career) | 39% | 37% |
| Tiebreak win % | 48% | 58% |
| Deciding-set win % (career) | 55% | 52% |
| Best-of-3 win % | 59% | 60% |
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