Alexander Zverev vs Cameron Norrie — R64 — Cincinnati Open

Broken in game 2 of the opening set and getting nothing back on return — two of 16 break points converted across the afternoon — the No. 1 seed looked bound for a repeat of his Canadian Open opener. Then the serve took over. Zverev won 94 percent of his first-serve points in the second set, broke Norrie in game 6 for 4-2, and closed with 16 aces to his opponent's three. The win ends a two-match losing run dating to the Wimbledon final and keeps the top seed's Cincinnati week alive. Two hours, 34 minutes for it, and Norrie is still without a win against Zverev on record.