The former top 20 player has spoken out after making a comment that could lead to him being suspended from the tour.
Temperatures are due to rise along with the humidity, with a chance of thunderstorms throughout the day.
The youngest player in this year's draw staged a remarkable comeback in her first round match.
The Australian finds himself caught up in yet more controversy following his latest match on the tour.
Two days into the final grand slam of the season and a quartet of big names have already crashed out of the men's draw.
The former world No.3 has insisted that there are 'two sides to every story' following criticism of her coach.
Rafael Nadal breezed into the second round of US Open 2019 with a comfortable straight-sets victory over John Millman.
Simona Halep talked about her high level of self-belief and her relief at ending her sequence of US Open first-round losses.
The world No.4 has suffered his earliest ever loss at Flushing Meadows.
Zverev is now 4-0 when it comes to playing five-set matches in 2019.
The world No.8 was far from happy following his shock loss at the New York grand slam.
Naomi Osaka started her US Open title defence with a three set victory over Anna Blinkova.
With great weather forecasted throughout this fortnight, the conditions should enable some phenomenal tennis at the Billie Jean King National Tennis Center.
Could there be a huge shock on the horizon in Flushing Meadows?
Ubitennis looks back at the winners and losers on the opening day of the New York Grand Slam.
The former world No.1 reacts to her one-sided loss to Serena Williams in New York.
The world No.59 said she was dumped by her mentor just days before the start of the final grand slam of the season.
Roger Federer overcame a nervy opening set to reach the second round at the US Open.
Serena Williams breezed through to the second round of the 2019 US Open with a straight-sets hammering of long-time rival Maria Sharapova.
Daniil Medvedev talked about how beating Djokovic boosted his confidence and his reaction to Nishikori's words of encouragement.