Belgian tennis player
Alexander Blockx (born 8 April 2005) is a Belgian tennis player. He has a career-high ATP singles ranking of world No. 146 achieved on 27 January 2025.
Early life.
Blockx has trained since childhood with Philippe Cassiers at his Forest Hills tennis academy in Belgium. By 2022, he was training at the Tennis Vlaanderen centre in Wilrijk, Antwerp alongside the likes of Tibo Colson, Zizou Bergs and Ruben Bemelmans.
Career.
Juniors.
In 2022, Blockx reached the third round and then quarterfinals of the junior events at Wimbledon and the US Open, respectively.
Shortly after the US Open, Blockx and sometimes junior doubles partner Gilles-Arnaud Bailly were invited to train with the Belgium Davis Cup team by captain Johan Van Herck. 
He reached a career-high junior ranking of No. 1 in singles and doubles on 1 May 2023 after winning the 2023 Australian Open in the boys singles and reaching the final in the boys doubles.
2022: Professional debut.
Blockx made his ATP Tour qualifying debut at his home tournament, the European Open in Antwerp, Belgium, 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: Australian Open Junior Champion, ATP and top 500 debuts.
Blockx reached the final at the 2023 Australian Open in both the boys' singles and, alongside Brazilian João Fonseca, the boys' doubles, which they lost to 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 junior Grand Slam finals in 2022, the last Belgian male to win a junior Major, prior to Blockx, was Kimmer Coppejans at the 2012 French Open. No Belgian male had previously won the boys' singles in Melbourne.
In March 2023, he made his Masters 1000 qualifications debut after receiving a wildcard for the 2023 Miami Open where he lost to Yosuke Watanuki.
He 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 own hometown, he lost to fifth seed Yannick Hanfmann in two close sets. Just a week after his first appearance in the ATP circuit, he won his first ITF title in Glasgow. And a week later, he remained unbeatable, 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 in his career on 6 November 2023.
2024: Maiden Challenger title, top 250 debut.
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 in the top 300 of No. 294 on 18 March 2024. 
In November, Blockx won his maiden Challenger title in Kobe, Japan defeating Jurij Rodionov in the final. He became the third youngest Belgian champion in Challenger history (after Libor Pimek and Olivier Rochus). En route to the title, he defeated for the first time a top 100 and home player Taro Daniel. As a result, he rose to No. 205 on 18 November 2024, which gave him a direct entry to Grand Slam qulifying rounds.
2025: Second Challenger title, top 150 debut.
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.
Performance timeline.
 ;templatestyles src="Refbegin/styles.css" / ;(W) winner; (F) finalist; (SF) semifinalist; (QF) quarterfinalist; (#R) rounds 4, 3, 2, 1; (RR) round-robin stage; (Q#) qualification round; (DNQ) did not qualify; (A) absent; (NH) not held; (SR) strike rate (events won / competed); (W–L) win–loss record.
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To avoid confusion and double counting, these charts are updated at the conclusion of a tournament or when the player's participation has ended.
References.
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