Stian Klaassen (born 19 April 2003) is a Dutch tennis player. He has a career high ATP singles ranking of No. 1,068 achieved on 28 July 2025 and a career high ATP doubles ranking of No. 454 achieved on 28 September 2026.
Klaassen has won one ATP Challenger doubles title at the 2026 San Diego Challenger.
Klaassen played college tennis at San Diego.
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