'Every night, just before I go to bed, I think the same thing: Will there be a nuclear attack tonight? What will happen the next time I wake up?'- Marta Kostyuk's heartbreaking confession

"The only one GOAT" - Marion Bartoli's husband and Belgian footballer Yahya Boumediene reacts to Novak Djokovic recording the highest win-percentage in tennis history

"If you feel anxious, stressed or depressed, talk to someone, get help" - Chris Evert urges fans to take better care of themselves on World Mental Health Day

"I don't know if he will be World No. 1 again" - Mischa Zverev on Novak Djokovic 

"Unfair; The sport should do better for the players and the events" - Pam Shriver sides with Iga Swiatek and blames WTA for scheduling issues

"This is heartbreaking, especially given what the guy went through" - Jon Wertheim on Juan Martin del Potro's good nature and difficulties after retirement 

"When you see grown guys tearing up like kids without control, it just proves how much tennis meant to him, how much he’s going to miss it” - Felix Auger-Aliassime on Roger Federer's farewell

Nick Kyrgios takes a sarcastic dig at fellow Aussie Bernard Tomic after his ITF Futures triumph  

"Even better that they’re so cool and down to earth as people" - Musician William DuVall on rocking out with Serena Williams and Venus Williams

"It is truly unbelievable the lengths these a**holes go to to cover it all up" - Martina Navratilova on child sex abuse within the Mormon Church

"Her body is the one that has demanded the most from me, even though I was in a first division men's handball team" - Ruben Mateu on Serena Williams' spectacular physique

"Roger will leave a bigger dent than Djokovic, he's a nicer icon than Nadal; what he did for tennis cannot be outweighed by results" - Tomas Berdych on Roger Federer

"I am generally impressed with the smoothness of his movements and how majestic he looks" - Iga Swiatek on what attributes of Roger Federer she wants to incorporate into her own game

Serena Williams and Roger Federer probably have more fans than anybody in tennis: Taylor Fritz

"I've always liked the way she came from nothing to achieve everything as a tennis player and as a woman" - Mihaela Buzarnescu on being inspired by Serena Williams

"I called my mum that night and told her I was moving to Spain" - Andy Murray recalls his frustrations of growing up alongside Rafael Nadal 

"I respect Roger as a legendary tennis player but also for his family values" - Novak Djokovic on Roger Federer's gentleman nature

“I think it’s special for me, personally, a young player coming up, to be up against these four legendary players” - Felix Auger-Aliassime on the opportunity to play against the 'Big 4' at Laver Cup

"There will be always new superstars" - Roger Federer on World No. 1 Carlos Alcaraz

"As common as Andy beating me on the golf course" - Mardy Fish pulls Andy Roddick's leg while discussing Canada's controversial Davis Cup qualification