Kokoro Isomura and Colin Sinclair will face off in the qualifications of the Brisbane 1 Challenger for the 1st time in their career. They are scheduled to play on Monday at 10:00 am on COURT 6. In this post, we analyze their head to head performance and prediction.
Prediction, odds and live streaming
The pick for Tennis Tonic is Kokoro Isomura who should win in 3 sets.
As per the initial odds, Kokoro Isomura is the pick to win this match.
Kokoro Isomura -> 1.57
Colin Sinclair -> 2.28
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Prediction and head to head Kokoro Isomura vs. Colin Sinclair
There is no head to head record between Kokoro Isomura and Colin Sinclair since this will be the first time that they will clash against each other in the main tour.
Kokoro Isomura
| Year | Total | Hard | Clay | I.hard | Grass | Carpet |
|---|---|---|---|---|---|---|
| 2025 | 23-21 | 21-20 | 0-0 | 2-1 | 0-0 | 0-0 |
| 2024 | 39-25 | 27-18 | 6-4 | 6-3 | 0-0 | 0-0 |
| 2023 | 25-30 | 25-29 | 0-1 | 0-0 | 0-0 | 0-0 |
| 2022 | 24-16 | 7-9 | 17-7 | 0-0 | 0-0 | 0-0 |
| 2021 | 6-8 | 4-2 | 2-6 | 0-0 | 0-0 | 0-0 |
Ranked no. 454, Isomura reached the qualifications after defeating Corban Crowther 4-6 6-3 6-4.
In the qualifications against Crowther, The Japanese recovered from a 1-set down deficit before winning (4-6 6-3 6-4). During the match, Isomura scored 100 points vs Crowther’s 87. Isomura was extremely aggressive to blast 41 winners.
Talking about the service games, Isomura scored just 1 ace in the encounter and he committed only 4 double faults. Kokoro Isomura lost the serve 4 times and he saved 4 break points. Furthermore, Isomura put 71% of his first serves in, winning 68% (41/60) of the points behind his 1st serve and 50% (12/24) on the 2nd serve. Isomura broke Crowther 5 times after converting 45% of his break points (5/11).
Isomura has a winning match record in the last 5 years having won 55% of his matches (98-81). 4-2 on hard in 2025. Talking about his performance on the same surface of this tournament, Isomura has a composed67-60 record in the last 5 years on hard.
Kokoro has an aggregate 4-2 win-loss record in 2025, 4-2 on hard (See FULL STATS).
Previously in the Brisbane 1 Challenger
The Japanese has never competed in this tournament before.
Colin Sinclair
| Year | Total | Hard | Clay | I.hard | Grass | Carpet |
|---|---|---|---|---|---|---|
| 2025 | 17-17 | 14-16 | 0-0 | 3-1 | 0-0 | 0-0 |
| 2024 | 22-17 | 18-15 | 4-2 | 0-0 | 0-0 | 0-0 |
| 2023 | 39-32 | 31-25 | 8-6 | 0-1 | 0-0 | 0-0 |
| 2022 | 31-22 | 22-14 | 7-5 | 2-3 | 0-0 | 0-0 |
| 2021 | 39-21 | 22-8 | 14-9 | 3-4 | 0-0 | 0-0 |
Ranked no. 731, Colin got to the qualifications after defeating Duje Markovina 6-7(5) 6-3 6-2.
In the qualifications against Markovina, Sinclair recovered from a 1-set down deficit before winning (6-75 6-3 6-2). During the match Sinclair scored 117 points vs Markovina’s 92. The Australian was quite aggressive to blast 45 winners.
About the serving games, Sinclair struck 14 aces and he was quite consistent in conceding no double faults for the entire match. Colin Sinclair lost the serve 3 times and he saved 2 break points. Furthermore, Sinclair put 70% of his first serves in, winning 75% (45/60) of the points behind his 1st serve and 46% (12/26) on the 2nd serve. Sinclair broke Markovina 6 times after converting 29% of his break points (6/21).
Colin has an overall 1-1 win-loss record in 2025, 1-1 on hard (See FULL STATS).
H2H Performance in the tournament
Matches, sets, games and points
| Points | Isomura | Sinclair |
|---|---|---|
| Match played | 1 | 1 |
| Tot Set | 3 | 3 |
| Tot Games | 29 | 30 |
| Pts | 100-87 | 117-92 |
| Total Points | 187 | 209 |
| Winners | 41 | 45 |
| %Winners | 41% | 38% |
Both Isomura and Sinclair played 1 match. Also both players started their run from the qualifications.Both players lost a set in the event. Kokoro Isomura conceded 1 set, while Colin Sinclair lost 1 set. Talking about their workload, Isomura and Sinclair have played the same amount of sets 3. However, Isomura played 1 game less than Sinclair. Kokoro scored 41 winners (41% of the total points). On the other side, Sinclair bagged 45 winners (38%).
Serve Performance
| Serve | Isomura | Sinclair |
|---|---|---|
| Aces | 1 | 14 |
| Avg per match | 1 | 14 |
| 1st in | 60/84 | 60/86 |
| %1st in | 71% | 70% |
| 1st pts | 41/60 | 45/60 |
| %1st pts | 68% | 75% |
| 2nd pts | 12/24 | 12/26 |
| %2nd pts | 50% | 46% |
Isomura bagged 1 ace . Sinclair also fired 14 aces . Isomura won 68% points behind his first serve. He had a solid display on his second serve to win 50% of the points. On the other side, Sinclair won 75% of the points on his first serve. He had a solid display on his second serve to win 46% of the points.
How they played the important points
| Breaks | Isomura | Sinclair |
|---|---|---|
| Won | 5 | 6 |
| Converted | 5/11 | 6/21 |
| % Converted | 45% | 29% |
| Conceded | 8 | 5 |
| Saved | 4 | 2 |
| % Saved | 50% | 40% |
| Times Broken | 4 | 3 |
Isomura broke his opponent 5 times with a 45% conversion rate. The Japanese lost his serve 4 times and he saved 50% of the break points that he conceded. Sinclair broke his opponent 6 times with a 29% conversion rate. The Australian conceded his serve 3 times and he saved 40% of the break points that he conceded.
| Isomura | |||
| Q1 Crowther |
Total | ||
|---|---|---|---|
| Score | 4-6 6-3 6-4 | ||
| Tot Set | 3 | 3 | |
| Tot Games | 29 | 29 | |
| pts | 100-87 | 100-87 | |
| Total points | 187 | 187 | |
| Winners | 41 | 41 | |
| %Winners | 41% | 41% | |
| SERVE | |||
| Aces | 1 | 1 | |
| Double Faults | 4 | 4 | |
| 1st in | 60/84 | 60/84 | |
| % 1st in | 71% | 71% | |
| 1st pts | 41/60 | 41/60 | |
| % 1st pts | 68% | 68% | |
| 2nd pts | 12/24 | 12/24 | |
| % 2nd pts | 50% | 50% | |
| Breaks | |||
| Won | 5 | 5 | |
| Converted | 5/11 | 5/11 | |
| Converted % | 45% | 45% | |
| Conceded | 8 | 8 | |
| Saved | 4/8 | 4 | |
| Saved % | 50% | 50% | |
| Times Broken | 4 | 4 | |
| Sinclair | |||
| Q1 Markovina |
Total | ||
|---|---|---|---|
| Score | 6-75 6-3 6-2 | ||
| Tot Set | 3 | 3 | |
| Tot Games | 30 | 30 | |
| pts | 117-92 | 117-92 | |
| Total points | 209 | 209 | |
| Winners | 45 | 45 | |
| %Winners | 38% | 38% | |
| SERVE | |||
| Aces | 14 | 14 | |
| Double Faults | 0 | 0 | |
| 1st in | 60/86 | 60/86 | |
| % 1st in | 70% | 70% | |
| 1st pts | 45/60 | 45/60 | |
| % 1st pts | 75% | 75% | |
| 2nd pts | 12/26 | 12/26 | |
| % 2nd pts | 46% | 46% | |
| Breaks | |||
| Won | 6 | 6 | |
| Converted | 6/21 | 6/21 | |
| Converted % | 29% | 29% | |
| Conceded | 5 | 5 | |
| Saved | 2/5 | 2 | |
| Saved % | 40% | 40% | |
| Times Broken | 3 | 3 | |
Head 2 Head
LLWLLWWWLL
LWLWWLWLWW 
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