Top 5 Photos, US Open Day 8: Vekic saves match point; Mertens dominant

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4. Diego Schwartzman brushed off a slow start to defeat Alexander Zverev, 3-6, 6-2, 6-4, 6-3. Zverev struggled both mentally and physically, hitting 17 double faults. Schwartzman  showed no signs of mercy for the world No. 6 to reach his third major quarterfinal and second in New York. The 27-year-old will face either Rafael Nadal or Marin Cilic next.

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5. Elise Mertens cruised past Kristie Ahn, 6-1, 6-1, to move into her first US Open quarterfinal. Mertens has won all eight of her sets, relinquishing no more than three games in each. The world No. 26 forced Ahn to get one more ball back and used her consistency to overwhelm the American. The Belgian is also in the doubles last eight with 'Sunshine Double' partner Aryna Sabalenka.

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Wake up every morning with Tennis Channel Live at the US Open, starting at 8 a.m. ET. For three hours leading up to the start of play, Tennis Channel's team will break down upcoming matches, review tournament storylines and focus on everything Flushing Meadows.

Tennis Channel's encore, all-night match coverage will begin every evening at 11 p.m. ET, with the exception of earlier starts on Saturday and Sunday of championship weekend.

Day 8 at the US Open brought a number of players their best New York showings, while a couple more high seeds saw their tournament come to an end. These are the Top 5 photos from New York.

1. World No. 23 Donna Vekic proved that it's "not over until it's over" by rallying back from match point down to claim her fourth-round matchup with Julia Goerges, 6-7 (5), 7-5, 6-3. This marks the 23-year-old's first time in the final eight of a Grand Slam event. Vekic will now face friend Belinda Bencic, who she defeated earlier this year at the French Open.

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2. Matteo Berrettini, who set a career-high ranking in June after winning the grass event in Stuttgart, continues to enjoy a breakout season. Berrettini halted Russian Andrey Rublev, 6-1, 6-4, 7-6 (6), to advance into his first Grand Slam quarterfinal. The world No. 25 is the first Italian man to reach the last eight at the US Open in 42 years and can extend his run with a win over Gael Monfils or Pablo Andujar.

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3. In two prior head-to-head matches this year, Belinda Bencic came out on top over Naomi Osaka. In Monday's fourth-round match, the outcome was no different, as the world No. 12 posted a 7-5, 6-4 victory to end the top seed's title defense. Bencic was consistent and moved the ball exceptionally well to secure her second quarterfinal appearance at the US Open.

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4. Diego Schwartzman brushed off a slow start to defeat Alexander Zverev, 3-6, 6-2, 6-4, 6-3. Zverev struggled both mentally and physically, hitting 17 double faults. Schwartzman  showed no signs of mercy for the world No. 6 to reach his third major quarterfinal and second in New York. The 27-year-old will face either Rafael Nadal or Marin Cilic next.

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5. Elise Mertens cruised past Kristie Ahn, 6-1, 6-1, to move into her first US Open quarterfinal. Mertens has won all eight of her sets, relinquishing no more than three games in each. The world No. 26 forced Ahn to get one more ball back and used her consistency to overwhelm the American. The Belgian is also in the doubles last eight with 'Sunshine Double' partner Aryna Sabalenka.

Getty Images

Wake up every morning with Tennis Channel Live at the US Open, starting at 8 a.m. ET. For three hours leading up to the start of play, Tennis Channel's team will break down upcoming matches, review tournament storylines and focus on everything Flushing Meadows.

Tennis Channel's encore, all-night match coverage will begin every evening at 11 p.m. ET, with the exception of earlier starts on Saturday and Sunday of championship weekend.