Ben Shelton vs Tallon Griekspoor — R128 — US Open

This one turned on the unforced-error column. Shelton gave away 14 of them in the opening set to Griekspoor's two, broken in game 1 and again in game 5 for 4-1, then trimmed his own count to 17 the rest of the way while the Dutchman piled up 22. The turn came on return. Shelton cashed 5 of 7 break chances against 3 of 8 the other way, and his first-serve points won read 92 percent through the middle two sets, though the third still needed a tiebreak after he broke in game 8 for 5-3. Two weeks on from the Canadian Open title and a first-match exit in Cincinnati, the eighth seed needed 2 hours 34 minutes to clear his US Open opener.