Has worked with coach Philippe Cassiers for the past 16 years
Blockx father Oleg was a track athlete, excelling in hurdle races while Blockx’s mother Natalia was a professional swimmer.
Was born in Antwerp
(UPDATED 27 AUGUST 2026)
Former World No. 1 junior broke into Top 100 in March 2026 and achieved career-high No. 32 in July 2026 after reaching his 1st ATP Tour final in Estoril.
Advanced to 1st ATP Masters 1000 QF and SF at 2026 Madrid after wins over No. 5 Auger-Aliassime and defending champion Ruud to become third Belgian ATP Masters 1000 semi-finalist after Goffin (5 times) and C. Rochus (2005 Hamburg).
Qualified for 2025 Next Gen ATP Finals and advanced to the final, losing to Tien in a rematch of 2023 Australian Open final in juniors and made Grand Slam main draw debut at 2026 Australian Open as LL.
Made his ATP Tour debut at 2023 Antwerp as Q and defeated Giron for 1st ATP Tour win of career at 2025 ATP Masters 1000 Cincinnati as Q.
Owns 72-38 Challenger record (4-2 in finals), winning titles at 2024 Kobe, 2025 Oeiras-3, 2025 Bratislava-2 and 2026 Canberra.
Went 108-48 in ITF juniors, highlighted by winning 2023 Australian Open boys’ singles, defeating Tien in the championship match, becoming 1st Belgian junior Grand Slam champion since Coppejans at 2012 Roland Garros.
Also reached boys’ doubles final at 2023 Australian Open partnering Fonseca (l. to Tien/Williams).
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