S. Klaassen: Ranking, Schedule & Stats
S. Klaassen is a professional tennis player from Netherlands, born 19 April 2003.
This page tracks S. Klaassen's upcoming schedule, latest results, recent form and surface record, with each match linking through to a detailed head-to-head and pre-match analysis. Scores update live as matches are played.
Ratings & strengths
Umpiry ratings · updated dailyBeyond today · rivals & careerBeyond today
Results
Career
More career statistics
Career serve & return
Absolute totals across the 0 matches we have on record. Green is Klaassen, grey is the same stat by the players they faced.
1st-serve points won by season
| Season | Klaassen | Opponents |
|---|---|---|
| 2026 | 67% | 70% |
| 2025 | 69% | 66% |
| 2024 | 62% | 66% |
| 2023 | 65% | 75% |
| Career | 66% | 68% |
Counted from the match statistics we hold, season by season — the cards above are career totals from our data provider, so the two can differ by a few tenths. Seasons with fewer than three matches on record are left out.
Career win–loss by level
| Level | W–L | Win % | Titles |
|---|---|---|---|
| ITF / Futures | 15–15 | 50% | 0 |
Challenger and ITF matches are shown in grey and are not part of the tour-level total.
Season breakdown
Wins and losses in one season, split by round reached, surface, tournament level and opponent ranking band.
2026 season · 10–8 · W–L 56% · 18 matches
Round played
| Qualifying | 1–0 (100%) |
|---|---|
| R32 | 4–3 (57%) |
| R16 | 1–3 (25%) |
| SF | 0–1 (0%) |
Surface
| Hard | 5–5 (50%) |
|---|---|
| Clay | 5–3 (63%) |
Tournament level
| ITF / Futures | 10–8 (56%) |
|---|
Rounds are the round each match was played in, not a ladder: a player enters a 32-draw straight in R32, and team events (United Cup, Davis Cup) are not played through a draw at all — those have their own row. Ranking bands use the opponent's ranking on match day and are cumulative: top 100 includes top 10.
Surface record by season
Each cell is one season on one surface: the number is wins–losses, the colour is the win rate. Carpet is counted as indoor hard.
| Season | Hard | Clay | Grass | I.hard | Total |
|---|---|---|---|---|---|
| 2026 | 5–5 | 5–3 | · | · | 10–8 |
| 2025 | 9–2 | 5–3 | · | · | 14–5 |
| 2024 | 4–3 | 7–6 | · | · | 11–9 |
| 2023 | · | 5–3 | · | · | 5–3 |
| 2022 | · | 0–1 | · | · | 0–1 |
| Career | 18–10 64% | 22–16 58% | · | · | 40–26 61% |
Record at one tournament
Every edition entered: year, best round reached, wins and losses. Most recent first.
M15 Alkmaar 1 · Editions 3 · Record 4–3 · Titles 0
| Year | Best round | W | L |
|---|---|---|---|
| 2025 | Q32 | 1 | 0 |
| 2024 | R32 | 1 | 2 |
| 2023 | R32 | 2 | 1 |
More on Umpiry · discovery
More players from Netherlands
All →Frequently asked · S. KlaassenFrequently asked
When was S. Klaassen born?
S. Klaassen was born on 19 April 2003 (23 years old).
Where is S. Klaassen from?
S. Klaassen is from Netherlands.