Ugo Humbert vs Michael Zheng — R64 — Cincinnati Open

The 24th seed never won a return game, going 0 for 9 there and 0 for 1 on break points. Humbert, whom the betting market made a narrow 51 percent favorite, piled up 43 unforced errors against 20 winners and added seven double faults. Zheng held all nine of his service games and faced one break point all afternoon, breaking to open the match and again in game 10 for 6-4. It is the 22-year-old American's best win by opponent ranking on record, one place past his Wimbledon win over Norrie, and the round of 32 in Cincinnati stands as his deepest Masters week of the season.