There was only composure and brilliance from the 20-year-old Tsitsipas who became Greece's first Grand Slam quarter-finalist and seems destined for bigger prizes in the near future.
It ended on a controversial note when a fan jumped the gun and shouted "out" on a Tsitsipas forehand with Federer 12-11 ahead.
The fearless Tsitsipas looked made for the big occasion, ruthlessly making Federer pay for his missed opportunities as he made major strides.
"There is nothing I can describe it to", said the 14th-seeded Tsitsipas to the crowd after his win.
"I'm happy for him".
"I managed to do that, I didn't lose my patience in some of the rallies that we played. It was very important to save those breakpoints". The world number 15 now faces Roberto Bautista-Agut - who has gone from strength to strength since beating Andy Murray - for a place in the semi-finals. Maria Sakkari "Steals" Roger Federer's Towel After Registering a Win Over Swiss Maestro in 2019 Hopman Cup; Watch Video. "I mean, she's really proving what she can do", said Sharapova, who sat at the same table as Anisimova at their agent's wedding a year ago.
"Definitely didn't go the way I expected with the breakpoints", Federer told reporters. "Winning at the end.I can not describe it". "I didn't and it cost me the game tonight".
Federer saw something of his old self in Tsitsipas, a rangy tyro with flowing, blond locks and an unswerving confidence.
'I guess so. He has a one-handed backhand and I used to have long hair, so maybe a little bit, ' reflected Federer ruefully, when asked for similarities between his young self and his conqueror, also pointing to the Greek's old-school continental grip.
Tsitsipas showed great composure to recover from a shaky start, having been given a time violation in the first game after failing to beat the serve clock. Anisimova won all eight of her service games, saving the lone break point she faced. However he rebounded and took away the set at 7-5.
The key stat Sunday night: Federer failed to convert any of the 12 break points he earned.
Federer was at his best once again, serving with terrifying accuracy and constantly putting pressure on his young American opponent, as the 37-year-old comfortably triumphed 6-2, 7-5, 6-2.
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