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William Jansen is a 21-year-old British professional on the ATP tour with 7 ranking points. Standing 188 cm, Jansen is a left-hander with a two-handed backhand. Jansen was born in London.
Our rating model puts Jansen at 1500 ELO across 57 rated matches, strongest on hard courts (1510). Jansen's next scheduled points drop is 2 points from M15 Dublin 1 on August 3, 2026, when that result rolls off the 52-week ranking, and 5 results currently count toward Jansen's ranking total.
<a href="https://atprank.com/player/william-jansen"><img src="https://atprank.com/api/card/player/william-jansen" alt="Live tennis ranking — atprank.com" width="640" height="180" /></a>Live card — updates automatically. Free to embed with the atprank.com link.
From matches in our dataset (2023–present).
Biggest upset victories — matches William Jansen won as the betting underdog, ranked by pre-match odds.
William Jansen’s wins over the highest-rated opponents, by the opponent’s pre-match ELO (since 2023).
Daniel De JongeM15 Dublin 1 2025 · 6-1 6-4ELO 1524def. 
Francesco FerrariM15 Monastir 51 2023 · 4-6 7-6(6) 6-1ELO 1523def. 
Loic Namigandet TenguereM15 Monastir 21 2024 · 4-6 6-1 6-1ELO 1522def. Hugo PierreM15 Dublin 1 2025 · 6-3 6-4ELO 1521def. 
Hiroki SakagawaM25 Columbus 1 2024 · 7-6(4) 6-2ELO 1519Last match Jul 16, 2026 · last win Jul 15, 2026
William Jansen's most-played opponents. Open any rivalry for the full meeting record and a win-probability prediction.
Pedro Araujo