Nick Kyrgios scored an upset victory in the quarterfinal of the Cincinnati Masters to beat No. 1 Rafa Nadal, 6-2, 7-5.
Nadal reached the No. 1 spot this week after Federer pulled out of Cincinnati after tweaking his back in Montreal the week before. It's Nadal's second straight disappointing performance in the lead-up to the US Open—he lost to 18-year-old Denis Shapovalov in the quarters in Montreal—and marks his third consecutive tournament exited before the semifinal (he lost to Gilles Muller in the round of 16 at Wimbledon).
The volatile Kyrgios, ranked 23rd in the world, served for the match at 5-4 in the second set but double faulted multiple times to hand Nadal the break.