Federer pumped his right fist after a backhand shot hugged the line to set up the break point that put him 5-3 up in the final set and again when he finished the match off — one of his few satisfying moments in months.
Federer was beaten in the second round at Wimbledon by Sergiy Stakhovsky, his earliest exit from a Grand Slam event since 2003. That ended Federer’s streak of reaching the quarter-finals in 36 straight majors.
The improbable upsets were just starting.
He then lost to a 114th-ranked qualifier in the semi-finals in Hamburg, Germany, and was beaten by a 55th-ranked player in his opening match in Gstaad, Switzerland.
He skipped Montreal last week to get ready for Cincinnati, hoping a good showing this week would get him ready for the US Open.
“Every match gives me more info to tell me if I’m on the right path or not, but I’m a strong believer that I am on the right path right now and I just need to make sure that mentally I stay cool about it,” Federer said.
“Today for a long time it wasn’t looking good, but these are the kind of matches I need right now,” he added.
Tursunov pulled off the day’s biggest upset, beating Ferrer 6-2, 6-4.
The world No. 44 never lost his serve while reaching the quarter-finals for the first time in six appearances at the event.