Alexander Blockx

Alexander Blockx (born 8 April 2005) is a Belgian professional tennis player. He has a career-high ATP singles ranking of world No. 32 achieved on 27 July 2026 and a best doubles ranking of No. 467, reached on 10 November 2025. He is the No. 1 Belgian singles player.

Blockx won the boys' singles title at the 2023 Australian Open. He represents Belgium at the Davis Cup.

Early life Blockx was born in Antwerp, Belgium, to a family of Ukrainian descent. Blockx's parents were both professional athletes: His father, Oleg, was a track athlete in hurdle races and his mother, Natalia, was a swimmer. He was introduced to tennis in his childhood by accompanying and observing his older brother Maxime taking his tennis lessons.

His coach, Philippe Cassiers, asked if the younger Blockx would also like to try playing tennis, and gave him a racquet. They started their partnership when Blockx was 4.

Career

Juniors Blockx reached the third round and then quarterfinals of major junior events of that season, at 2022 Wimbledon and at the 2022 US Open. The following year, Blockx reached the final at the 2023 Australian Open in both the boys' singles and doubles categories. Partnering with Brazilian João Fonseca, he was the runner-up in doubles, defeated by Learner Tien and Cooper Williams. Blockx gained revenge over Tien by winning the boys' singles final in three sets. Although Gilles-Arnaud Bailly reached two major junior finals in 2022, the last Belgian boy to lift a title at this level, prior to Blockx, was Kimmer Coppejans at the 2012 French Open. Blockx had good results in Juniors, maintaining a 108–48 singles win-loss record, and reached an ITF junior combined ranking of world No. 1 on 1 May 2023.

2022: Beginnings, ATP doubles debut Blockx made his ATP Tour qualifying debut at his national tournament, the 2022 European Open in his hometown, Antwerp, where he was given a wildcard. He lost to Swiss Dominic Stricker in straight sets.

He was also given a wildcard into the main draw of the doubles, playing alongside Ruben Bemelmans in what proved to be Bemelmans' last professional match.

2023: ATP singles and top 500 debuts In March, Blockx made his Masters 1000 qualifications debut after receiving a wildcard for the 2023 Miami Open, where he lost to Yosuke Watanuki.

Blockx received a wildcard for the qualifying competition at the Antwerp Open and qualified into the main draw on his ATP singles debut. In his very first ATP Tour singles main draw match ever in his hometown, he lost to fifth seed Yannick Hanfmann in two close sets. Just a week after his first appearance on the ATP circuit, he won his first ITF title in Glasgow. One week later he won his second title in Sunderland. Partly due to his first qualification for an ATP tournament and winning two ITF titles, he entered the top 500 for the first time on 6 November 2023.

2024: Maiden Challenger title, top 250 Blockx received a wildcard for the qualifying competition at the 2024 Australian Open. He also received a qualifying wildcard for the 2024 Miami Open but lost to Pedro Martinez in the first round. He reached a new career-high ranking of No. 294 on 18 March 2024.

2025: First ATP win, NextGen finalist, top 125 In January, Blockx won his second Challenger title in Oeiras, Portugal, defeating Liam Draxl in the final. He became the youngest Belgian to earn multiple trophies at that level. As a result, he entered the top 150 in the singles rankings on 27 January 2025. Blockx made his Masters main draw debut at the 2025 Miami Open as a qualifier but lost to Corentin Moutet.

In July, Blockx reached his third Challenger final at the Winnipeg Challenger, losing to Liam Draxl in the final. Blockx entered his second Masters 1000 main draw as a qualifier at the National Bank Open in Toronto. Ranked at a career high of world No. 119, achieved on 4 August 2025, Blockx also qualified for the main draw at the Cincinnati Open, where he recorded his first ATP Tour win, as well as his first Masters 1000 win, by defeating Marcos Giron. The result solidified Blockx's fifth position in the NextGen Live Race to Jeddah. Blockx won his second Challenger of the 2025 season at the 2025 Slovak Open, and moved to fourth in the NextGen race. At the 2025 Moselle Open, Blockx received an entry through the Next Gen Accelerator programme and recorded his second tour-level win, defeating qualifier Francesco Passaro. As a result, he moved up to world No. 101 in the singles rankings on 10 November 2025.

Blockx reached the 2025 Next Gen ATP Finals championship match, but lost to previous year finalist Learner Tien.

2026: Major debut, Masters semifinal, ATP final, top 35 In January, Blockx won his fourth Challenger singles trophy at the Canberra International, defeating qualifier Rafael Jódar in the final. As a result of that title, he entered the top 100 on 12 January 2026. Later in the month, Blockx made his major debut at the Australian Open as a lucky loser, following the withdrawal of Arthur Cazaux. He lost in the first round to Jaime Faria in four sets.

In February, Blockx reached his second Challenger final of the season in Lille, losing to seventh seed and home favourite Luca Van Assche in the final.

In April, Blockx won his first ATP Tour matches on clay with a run to the third round as a qualifier, at the 2026 Monte-Carlo Masters. His defeat over Flavio Cobolli in the second round was his first top-20 win. At the next Masters, the 2026 Mutua Madrid Open, he defeated third seed Félix Auger-Aliassime in the third round, recording his first Top-10 win. Next the Belgian defeated 16th seed Francisco Cerúndolo, as well as defending champion Casper Ruud in straight sets to reach his first Masters 1000 semifinal. Blockx became only the second man born in 2005 or later, after Jakub Menšík, to reach the semifinals at a Masters event. He lost to second seed Alexander Zverev. As a result, he entered the Top 40 at world No. 36 and became the No. 1 Belgian player in the ATP singles rankings on 4 May 2026.

Blockx reached the second round on his debut in the main draw at the 2026 French Open with a straight sets win against Coleman Wong, but was forced to withdraw with an ankle injury prior to his second round match against 8th seed Alex de Minaur.

In July, Blockx reached his first ATP Tour final at the Estoril Open. but lost to Luca Van Assche. As a result, despite the loss, he entered the top 35 at a new career-high singles ranking of world No. 32 on 27 July 2026.

Coaching Since 2022, Blockx partly trains at the Tennis Vlaanderen in Antwerp and Cassiers' Forest Hills Tennis Academy. He was coached by Philippe Cassiers from 2010 until 2026.

Performance timeline

Singles Current through the 2026 Wimbledon Championships.

ATP Tour finals

Singles: 1 (runner-up) LegendGrand Slam (–)ATP 1000 (–)ATP 500 (–)ATP 250 (0–1)Finals by surfaceHard (–)Clay (0–1)Grass (–)Finals by settingOutdoor (0–1)Indoor (–)

Next Gen ATP finals

Singles: 1 (runner-up) ResultDateTournamentSurfaceOpponentScoreLossNext Gen ATP Finals, Saudi ArabiaHard (i) Learner Tien3–4(4–7), 2–4, 1–4

ATP Challenger Tour finals

Singles: 6 (4 titles, 2 runner-ups)

Finals by surfaceHard (4–2)Clay (–)

Doubles: 1 (runner-up)

ITF World Tennis Tour finals

Singles: 4 (2 titles, 2 runner-ups)

Finals by surfaceHard (2–2)Clay (–)

Doubles: 1 (runner-up)

Junior Grand Slam finals

Singles: 1 (title)

Doubles: 1 (runner-up)

Wins over top-10 players Blockx has a match record against players who were, at the time the match was played, ranked in the top 10.