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Seita Watanabe is a 25-year-old Japanese professional on the ATP tour with 2 ranking points. Standing 180 cm, Watanabe is a right-hander with a two-handed backhand. Watanabe was born in Fukushima.
Our rating model puts Watanabe at 1462 ELO across 68 rated matches, strongest on grass (1500). Watanabe's next scheduled points drop is 2 points from Guangzhou Challenger on September 7, 2026, when that result rolls off the 52-week ranking, and 1 result currently count toward Watanabe's ranking total.
<a href="https://atprank.com/player/seita-watanabe"><img src="https://atprank.com/api/card/player/seita-watanabe" 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 Seita Watanabe won as the betting underdog, ranked by pre-match odds.
Seita Watanabe’s wins over the highest-rated opponents, by the opponent’s pre-match ELO (since 2023).
Thasaporn NakloBurnie 2 Challenger 2024 · 7-6(2) 6-3ELO 1551def. 
Felix CorwinConcepcion Challenger 2024 · 3-6 6-2 6-4ELO 1537def. 
Mitsuki Wei Kang LeongM25 Takasaki 1 2023 · 6-4 6-4ELO 1521def. 
Karan SinghAstana Challenger 2024 · 6-2 6-7(5) 6-3ELO 1508def. 
Matthew HulmePlayford Challenger 2024 · 6-4 1-6 7-6(8)ELO 1507Last match Mar 1, 2026 · last win Oct 27, 2024
Seita Watanabe's most-played opponents. Open any rivalry for the full meeting record and a win-probability prediction.