Frances Tiafoe defeated Felix Auger Aliassime 3-6 6-3 in the Halle quarter-final on grass. The upset overturned the form book — Felix Auger Aliassime came in ranked #5, leading the head-to-head 3–0, defending last year's round of 16. Frances Tiafoe claimed a first win over Felix Auger Aliassime in four meetings, narrowing the head-to-head to 3–1.
Tiafoe F. won the match.
Tiafoe F. and Auger-Aliassime F. faced 10 of the same opponents in the last 12 months. Tiafoe F. went 6–7 (46%) against them, Auger-Aliassime F. 8–8 (50%). Results against comparable opponents are close (2 : 3 better-results split).
Grass: Tiafoe F. leads 1–0 · Hard: Auger-Aliassime F. leads 2–0 · Clay: Auger-Aliassime F. leads 1–0