Live points verified daily against the official ranking: 998 of 1,000 in the ATP top 1,000 match to the point. How we check ›
Guillaume Dalmasso, a 23-year-old French professional, holds the #558 spot in the live ATP rankings with 72 points. Dalmasso slipped 4 places in the latest ranking update. Standing 193 cm, Dalmasso is a right-hander with a two-handed backhand.
Dalmasso was born in Metz. Our rating model puts Dalmasso at 1524 ELO across 160 rated matches, strongest on hard courts (1537). Dalmasso's next scheduled points drop is 8 points from M15 Santa Tecla 2 on July 27, 2026, when that result rolls off the 52-week ranking, and 18 results currently count toward Dalmasso's ranking total.
<a href="https://atprank.com/player/guillaume-dalmasso"><img src="https://atprank.com/api/card/player/guillaume-dalmasso" 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 Guillaume Dalmasso won as the betting underdog, ranked by pre-match odds.
Victor LilovM25 Castelo Branco 1 2023 · 7-6(6) 6-3@6.05def. 
Naoya HondaCenturion 1 Challenger 2026 · 3-6 6-3 6-4@3.14def. 
Pietro Orlando FellinM15 San Jose 1 2026 · 6-4 7-5@2.98def. 
Pablo Masjuan GinelM15 Madrid 2 2024 · 6-7(3) 7-5 6-1@2.52def. 
Niels LootsmaM15 Heraklion 6 2024 · 6-3 7-6(8)@2.25Guillaume Dalmasso’s wins over the highest-rated opponents, by the opponent’s pre-match ELO (since 2023).
Pietro Orlando FellinM15 San Jose 1 2026 · 6-4 7-5ELO 1575def. Daniel MilavskyM15 Santa Tecla 2 2025 · 7-6(5) 6-7(4) 6-0ELO 1571def. 
Olaf PieczkowskiM15 San Jose 1 2026 · 6-7(3) 6-4 6-4ELO 1556def. Martyn PawelskiM25 Castelo Branco 1 2023 · 6-7(3) 6-3 3-0 ret.ELO 1555def. 
Karan SinghCenturion 1 Challenger 2026 · 7-6(4) 4-1 ret.ELO 15451-match win streak · Last match Jul 12, 2026 · last win Jul 12, 2026
Level on points with Alec Beckley at #557.
Points needed to reach each tier, assuming other players’ totals stay the same.
Valid results outside the best-18 that don't count toward the ranking right now — they promote in as counting results drop off.
Guillaume Dalmasso's most-played opponents. Open any rivalry for the full meeting record and a win-probability prediction.