Madison Keys shocked Iga Swiatek 6–3, 6–4 on Aug. 18 to move into the Cincinnati Open quarter-finals, further disrupting the world number one’s preparations for the U.S. Open.
Swiatek, who won her 50th match of the year in the previous round, saved four match points but was far from her best as she again exited a second tournament in the U.S. swing at the last-16 stage after last week’s Canadian Open.