Ben Solomon for The New York Times
After a summer in which his results plummeted so far that he nearly walked away for a long break, Grigor Dimitrov has reset himself in time to become the most surprising semifinalist at the United States Open.
“I didn’t expect things to unfold for me like this,” Dimitrov said Wednesday, a day after he stunned Roger Federer in his first visit to the U.S. Open quarterfinals. “Since the past five, six weeks, it was definitely hard to believe.”
Dimitrov’s current upswing, which he hopes to continue Friday in his semifinal against fifth-seeded Daniil Medvedev, has followed a summer of lows.