Hiromasa Koyama vs Qian SunPrediction, Head-to-Head Results, and Stats
Hiromasa Koyama and Qian Sun have met 1 time since 2026; Qian Sun leads 1–0. Across all meetings Koyama has taken 0 sets to Sun's 2. Their most recent meeting: Qian Sun won at M15 Wuning (2026).
Spread & Straight-Sets Form
Completed best-of-3 matches · Last 12 months
| Indicator | Koyama | Sun | ||
|---|---|---|---|---|
| Indicator | Hiromasa Koyama | Qian Sun | ||
| Wins in straight sets | 73% | 24/33 | 50% | 12/24 |
| Wins a set when losing | 20% | 4/20 | 40% | 10/25 |
| Goes to a deciding set | 25% | 13/53 | 45% | 22/49 |
| Covers −1.5 sets as favorite | 63% | 10/16 | 18% | 3/17 |
| Covers +1.5 sets as underdog | 48% | 12/25 | 69% | 18/26 |
| Tiebreak sets won | 56% | 9/16 | 39% | 7/18 |
| Wins after taking set 1 | 90% | 28/31 | 70% | 16/23 |
| Wins 2-0 after taking set 1 | 77% | 24/31 | 52% | 12/23 |
Colored rows are higher-is-better: green above 50%, red below. Favorite/underdog set by book odds; cover rows count only matches with odds on record. Head-to-head: 1 of 1 completed meetings ended in straight sets (Koyama 0, Sun 1).
Style Matchup
Playing styles and historical archetype record
Koyama
🧱 The Wall
Sun
💥 Big Hitter
Matchup analysis
The 💥 Big Hitter archetype wins about 57% vs 🧱 The Wall across 374 matches in our dataset: a stylistic lean toward Qian Sun.
Big Hitter players often use power groundstrokes and high winner count to pressure the the wall's elite returner.
Previous meetings
1 career meeting, newest first
Sep 3, 2026
M15 Wuning
H Hard · 2nd Round
Prop Research
Hit rates on common betting markets · Last 90 days
| Outcome | Koyama | Sun | ||
|---|---|---|---|---|
| Outcome | Hiromasa Koyama | Qian Sun | ||
| 1 or more | 42% | 5/12 | 100% | 16/16 |
| 3 or more | 17% | 2/12 | 75% | 12/16 |
| 5 or more | 0% | 0/12 | 56% | 9/16 |
| 10 or more | 0% | 0/12 | 6% | 1/16 |
| 15 or more | 0% | 0/12 | 0% | 0/16 |
| 20 or more | 0% | 0/12 | 0% | 0/16 |
Player ROI
Hypothetical if you put 1u on each player to win every one of their matches · Last 90 days
| Metric | Koyama | Sun |
|---|---|---|
| W-L | 10–3 | 7–9 |
| Avg odds | 2.14 | 2.40 |
| ROI % | +30.8% | -8.6% |
| Units P/L | +4.00u | -1.38u |
Common opponents
Results vs. opponents both players faced · Last 12 months
Koyama has a higher win rate against shared opponents (100% vs Sun's 60%).
| Opponent | Koyama | Sun |
|---|---|---|
| Lachlan Vickery | W 63 62 | W 67 63 61 |
| Zichen Shao | W 64 64 | L 36 67 |
| Yue Xia | W 61 64 | W 64 76 |
| Colin Sinclair | W 76 76 | W 46 62 76 |
| Noritaka Koizumi | W 64 64 | L 26 26 |
Recent Form
Last five matches per player
Zhao Zhao
M15 Wuning · Final
Sep 13
Jaesung Choe
M15 Wuning · Semifinals
Sep 12
Wishaya Trongcharoenchaikul
M15 Wuning · Quarterfinals
Sep 11
Zichen Shao
M15 Wuning · 2nd Round
Sep 10
Zichen Shao
M15 Wuning · 2nd Round
Sep 10
Yue Xia
M15 Wuning · 1st Round
Sep 9
Qian Sun
M15 Wuning · 2nd Round
Sep 3
Lachlan Vickery
M15 Wuning · 1st Round
Sep 2
Hayato Matsuoka
Jinan Challenger · 1st Round Qualifying
Oct 11
Nino Ehrenschneider
M25 Luan · 1st Round
Oct 7
Alibek Kachmazov
M25 Guiyang · 2nd Round
Sep 17
Lachlan Vickery
M25 Guiyang · 1st Round
Sep 16
Yuta Tomida
M15 Wuning · Final
Sep 6
Colin Sinclair
M15 Wuning · Semifinals
Sep 5
Miles Jones
M15 Wuning · Quarterfinals
Sep 4
Hiromasa Koyama
M15 Wuning · 2nd Round
Sep 3
Win rate
Matches, sets and games won · Last 12 months · 49–53 matches
| Metric | Koyama | Sun |
|---|---|---|
| Matches won | 62% | 49% |
| Sets won | 59% | 48% |
| Games won | 53% | 51% |
Record by tier
Head-to-head record by tournament tier
| Stage | Koyama | Sun |
|---|---|---|
| ITF M15 | 0 | 1 |
By surface
Head-to-head record per surface
| Surface | Koyama | Sun |
|---|---|---|
| Hard | 0 | 1 |
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