[2][3][4] By 2022, he was training at the Tennis Vlaanderen centre in Wilrijk, Antwerp alongside the likes of Tibo Colson, Zizou Bergs and Ruben Bemelmans.

[7] 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.

[9] Blockx made his ATP Tour qualifying debut at his home tournament, the European Open in Antwerp, Belgium, where he was given a wildcard.

[15] 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.

[18] 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.

[citation needed] 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.

[20] In November, Blockx won his maiden Challenger title in Kobe, Japan defeating Jurij Rodionov in the final.