Key quotes from the first day of the US Open at the Billie Jean King National Tennis Centre in Flushing Meadows on Sunday:
"It's something that I've been carrying, unfortunately, pretty much every match this year. Vomiting, throwing up ... Then my whole body starts to collapse, basically cramping and pain."
– Serbian legend Novak Djokovic reflects on the mysterious illness that has hampered his season after a shock first round exit.
"I was so nervous. I was like sending GIFs of what I felt like. It was GIFs of people freaking out and stuff ... Always the first round of a Slam there's a ton of nerves."
– World No 3 Jessica Pegula, after prevailing in straight sets over Romanian Elena-Gabriela Ruse in this year's opening match on Arthur Ashe Stadium.
"It's funny, I watched the highlights of her previous match and she saved eight match points and won. I was trying not to think about it."
– Uzbekistan's Kamilla Rakhimova after converting her seventh match point to beat two-time Grand Slam winner Barbora Krejcikova, who famously saved eight match points in a US Open fourth-round win over Taylor Townsend last year.
"I don't know why I was super dry in my mouth and water was not helping, so the only solution was chewing gum. I probably watch too much baseball. For whatever reason they all chew gum. I was like, 'You know what, I'm losing all the matches. I need to try to do like baseball guys.'"
– World No 8 Daniil Medvedev on what motivated the mid-match mastication during his straight-set win over Hugo Gaston in the first round of the US Open.
"I literally took my trainer on my honeymoon."
– American Tommy Paul, explaining that he kept his head in the game after marrying influencer and entrepreneur Paige Lorenze in July.
"I didn't cry, but almost. He's my idol, but he's also one of the best ever representatives of our sport, not only for how many titles he won but I think with his personality, too."
– Italian Jasmine Paolina, who got inspiration for her first-round victory over Veronika Erjavec by watching some of Swiss great Roger Federer's induction into the Tennis Hall of Fame.