Canadian Felix Auger-Aliassime beats Reilly Opelka at the Citi Open in Washington, D.C. | ATP Tour

#NextGenATP Canadian Felix Auger-Aliassime reached his second quarter-final of the season on Wednesday, defeating 6 & # 39; 11 "Reilly Opelka of the United States 6-4, 3-6, 6-4 at the Citi Open in Washington, DC

The winner of each set did not face a breaking point in the set, with Auger-Aliassime breaking Opelka in the 10^th game of the third. Opelka saved one match point at 4-5, 30/40 with a rebounded second serve.

But, on his second match point, Auger-Aliassime received a first-serve rocket, and Opelka pushed a tight backpack into the net. Auger-Aliassime earned 89 percent of its first-serve points (42/47).

"He was serving incredible. I even moved my position. I was trying to mix up the positions. Every time I was nasty at the same place. It was just frustrating. How did he manage to get me on that same line again? Auger-Aliassime said. "Again, I had to deal with it. I was able to return well in the third set. [There are] Frustrating moments in a tennis match, but that's the way it is. "

The 18-year-old Canadian will meet incoming sixth seed Marin Cilic, who is aiming to make his second quarter-final of the season (Madrid, with Djokovic).

Fifth seed John Isner, another great serving American, had better luck, saving all six of the breaks faced off against Hubert Hurkacz of Poland to advance 6-4, 6-4. Isner struck out 14 aces and gained 66 percent of his second serve points (19/29).

"I had to save a lot of break points," said Isner, who saved all six in his first two serve games. "At some point in the match, I started playing really well. Probably 3-all in the first set, I started picking it up. In my opinion, I was lucky even at 3-all, so I'm happy with the win."

Thirteen of Isner's 15 ATP tour titles came on US soil, and 10 on hard courts. He also leads the draw in Washington wins, with a 25-10 record. Isner, however, has never won the Citi Open, finishing a championship in 2007, 2013 and 2015. He will later meet Frenchman Benoit Paire or Aussie Marc Polmans.

#NextGenATP Serbia's Miomir Kecmanovic collected his 16th^th win of the season with a 3-6, 6-4, 7-6 (5) win against 15^th seed Pierre-Hugues Herbert of France. The 19-year-old will face Slovakian loser Norbert Gombos, who took fourth seed Kevin Anderson's place in the draw on Wednesday (right knee) and then beat Adrian Mannarino of France 6-4, 7-6 (9) , saving two sets. points in the tie, at 6/7 and 8/9.