Stefanos Tsitsipas congratulated Serena Williams on "an amazing career" and urged her to return to the Tour one day as Olympia's coach. In 2017, Williams and her husband Alexis Ohanian welcomed their first chilld, a baby girl Olympia.
Williams is retiring after this year's US Open and Tsitsipas made sure to send a lovely message to the retiring great. "Hey Serena, I'd like to congratulate you on an amazing career," Tsitsipas told Eurosport Greece.
"You're probably the only female player that has aced me in a match so congratulations for that too - wasn't very entertaining for me!"
Tsitsipas to Williams: Return back with Olympia as her coach one day
"But I have lots of respect for (what) you've done for the sport.
I'm more than inspired to have shared a fair amount of time with you on the tour. Good luck on the next chapter, and make sure to return back with Olympia as her coach one day," Tsitsipas added. "And obviously the most important thing - you're a great mother, I've been seeing that over the last couple of years.
Stay happy and enjoy your moments off tour." Williams is retiring after this year's US Open, while it's still a mistery for how long Roger Federer plans to play. Federer is set to return to action in late September, at the Laver Cup.
There, Federer will be Stefanos Tsitsipas' teammate as they are set to represent Team Europe. "I have all the respect for him and Serena. I really wish one day I can do 1/10th of what they have achieved and done, be part of their legacy, be part of their history that they have created in tennis," Tsitsipas said of Williams and Federer.
Meanwhile, Tsitsipas is preparing to kick off his US Open campaign. In the US Open first round, Tsitsipas plays Daniel Elahi Galan Riveros.