Clay Court Statistics Overview
Koji Watanabe has found clay courts difficult, recording 6–10 across 16 matches (37.5%). The numbers point to a surface that has not consistently suited the game — a key area of opportunity on the calendar.
At Grand Slam level (Roland Garros): Koji Watanabe has yet to record a win on clay at this stage — 0–2 across 2 Grand Slam matches. Breaking through here would mark a significant step forward on this surface.
By format on clay — best-of-five: 2–5 (28.6%); best-of-three: 4–5 (44.4%). Markedly stronger in three-set formats; the win rate drops noticeably in five-setters, which has direct implications for Grand Slam performance on clay.
Best season: 1968 — 5–3 (62.5%) from 8 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.
Koji Watanabe Clay Court Record by Year
| Year | W | L | Win% | Titles | Finals | SF | QF |
|---|---|---|---|---|---|---|---|
| 1970 | 0 | 3 | 0.0% | 0 | 0 | 0 | 0 |
| 1969 | 1 | 4 | 20.0% | 0 | 0 | 0 | 0 |
| 1968 | 5 | 3 | 62.5% | 0 | 0 | 0 | 0 |
Recent Clay Court Matches
| Date | Result | Opponent | Tournament | Round | Score |
|---|---|---|---|---|---|
| 1970-05-25 | Loss | Francois Jauffret | Roland Garros | R128 | 7-5 6-3 6-1 |
| 1970-04-17 | Loss | Dick Crealy | Davis Cup AME F: JPN vs AUS | RR | 9-11 6-2 6-1 3-6 6-3 |
| 1970-04-17 | Loss | Allan Stone | Davis Cup AME F: JPN vs AUS | RR | 8-6 7-9 6-4 6-0 |
| 1969-08-11 | Win | Zlatko Ivancic | Kitzbuhel | R32 | 5-7 6-1 6-3 |
| 1969-08-11 | Loss | Zeljko Franulovic | Kitzbuhel | R16 | 6-4 8-10 6-2 |
| 1969-07-22 | Loss | Francois Jauffret | Gstaad | R32 | 6-4 6-3 |
| 1969-07-14 | Loss | Patricio Rodriguez | Aix-en-Provence | R32 | 9-7 6-3 |
| 1969-05-26 | Loss | Rod Laver | Roland Garros | R128 | 6-1 6-1 6-1 |
| 1968-08-05 | Win | Frew McMillan | Hamburg | R32 | 6-1 7-5 1-6 6-4 |
| 1968-08-05 | Win | Uwe Gottschalk | Hamburg | R64 | 6-4 7-5 6-2 |
Koji Watanabe
Matches — Clay