Jan Siemerink has a competitive career record of 273–271 across 544 matches (50.2%). The record shows a player capable of competing at Tour level, though there is clear room to push the win rate higher. 4 titles: Nottingham, Rotterdam, Toulouse, Singapore — a record that reflects consistent ability to close out tournaments.
At Grand Slam level (Australian Open, Roland Garros, Wimbledon, US Open): Jan Siemerink is 32–41 (43.8%) across 73 Grand Slam matches — below .500, though the elite draw depth makes that a notoriously difficult barrier.
ATP Masters 1000 (Indian Wells, Miami, Monte Carlo, Madrid, Rome, Canada, Cincinnati, Shanghai, Paris): Jan Siemerink is 44–53 (45.4%) across 97 Masters matches — below .500 in the Tour's deepest fields. Lifting that record here would unlock better results across the calendar.
12 finals reached — won 4, lost 8 (33% conversion) — capable of reaching finals consistently, with room to improve at the decisive moment. 24 semifinals. 45 quarterfinals.
vs. Top 10: 21–48 (30.4%, 69 matches). Top 10 opponents have represented a clear ceiling; addressing that deficit is the single biggest lever for improving the overall record.
By format — best-of-five: 39–54 (41.9%); best-of-three: 234–217 (51.9%). Markedly stronger in three-set formats; the win rate drops noticeably in five-setters, which has direct implications for Grand Slam performance.
Dominant season: 1998 — 41–24 (63.1%) from 65 matches. That year represents a level of dominance that sets the ceiling for what Jan Siemerink can produce.
