John Isner defeated Steve Darcis 6-3 6-4 6-7 6-3 in the US Open round of 64 on hard.
Isner J. came through in four sets.
Isner J. and Darcis S. faced 3 of the same opponents in the last 12 months. Isner J. went 2–2 (50%) against them, Darcis S. 1–2 (33%). Only 2 of the comparisons are context-comparable — too few for a conclusion.
Only 3 common opponents — small sample, treat as indicative.