The second day at the US Open did not disappoint. Many top players were pushed to their limits but managed to fight through tough opponents to escape first-round upsets.

These are the Top 5 photos from New York.

1

Felix Auger-Aliassime

The world No. 21-ranked Canadian had a strong first-round opponent in Thiago Monteiro and had to survive an almost four-hour battle. Auger-Aliassime would close out a grueling 6-3, 6-7( 7), 7-6 (6), 7-6 (6) win to set up a meeting with Andy Murray.

Top 5 Photos, 9/1:
Auger-Aliassime 
slips past Monteiro

Top 5 Photos, 9/1: Auger-Aliassime slips past Monteiro

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AP Images

2

Andy Murray

Murray had a solid showing at last week's Western and Southern Open with wins over Frances Tiafoe and Alexander Zverev. The warm-up action helped gear him up for the physical demands of his opening round against Yoshi Nishioka. He'd post a 4-6, 4-6, 7-6 (5), 7-6( 4), 6-4 comeback win to reach the second round.

Top 5 Photos, 9/1:
Auger-Aliassime 
slips past Monteiro

Top 5 Photos, 9/1: Auger-Aliassime slips past Monteiro

Getty

3

Naomi Osaka

The 2018 US Open champion enjoyed her day off by sitting back and watching Japan's Nishioka take on Murray from her suite inside Arthur Ashe Stadium. The world No. 9 is set to take on Camila Giorgi on Wednesday.

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Top 5 Photos, 9/1:
Auger-Aliassime 
slips past Monteiro

Top 5 Photos, 9/1: Auger-Aliassime slips past Monteiro

AP Images

4

Sofia Kenin

The No. 2 seed is into the second round after dismissing Yanina Wickmayer, 6-2, 6-2, on Louis Armstrong Stadium. The Australian Open champion was on fire and dominated the court from start to finish. A much higher level of play was revealed in her opener compared to nine days ago when she fell to Alize Cornet.

Top 5 Photos, 9/1:
Auger-Aliassime 
slips past Monteiro

Top 5 Photos, 9/1: Auger-Aliassime slips past Monteiro

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Getty

5

Amanda Anisimova

The No. 22 seed is off to a solid start as she defeated Viktoriya Tomova, 7-5, 7-5, to set up a second-round meeting with wild card Katrina Scott. Scott, just 16 years old, pulled out a 7-6 (3) 6-2 win against Natalia Vikhlyantseva in her Grand Slam debut.

Top 5 Photos, 9/1:
Auger-Aliassime 
slips past Monteiro

Top 5 Photos, 9/1: Auger-Aliassime slips past Monteiro

Getty