Katie Boulter vs Katie Volynets — R128 — Cincinnati Open

Second serves settled it. Boulter won 19 of 38 points behind hers while Volynets managed 12 of 35, a margin that had to survive a middle set in which the Briton won 7 percent of her first-serve points to the American's 90 and was broken for 4-0. Then the serve returned. Boulter won 76 percent of her first-serve points in the decider, was broken back in game 8 for 4-4, and broke again in game 9 for 5-4. Volynets, the wild card the betting market favored at 53 percent, out-scored her 91-84 in total points and 15-13 in games and lost anyway, saving one match point before the end arrived 4 hours, 5 minutes in. The result ends five straight defeats for the 30-year-old, her first win since her run to the Queen's Club semifinals in June.