But she said so much more on a sweet Instagram (see it below) with a photo of them playing each other for the first time in a 2019 mixed-doubles match.
Williams, whose recent US Open run to the third round was likely her last tournament, congratulated the 20-time Grand Slam champion on a career “done perfectly.”
“I’ve always looked up to you and admired you,” Williams wrote. “Our paths were always so similar, so much the same. You have inspired countless millions and millions of people, including me.”
“Welcome to the retirement club,” she added.
Williams’ shoutout was arguably her strongest statement that she played her last game. Williams, winner of 23 major singles titles, previously announced she would be stepping away from tennis after the Open, but has not given a specific date for her full retirement.
Federer said his last Association of Tennis Professionals event will be at the Laver Cup in London from September 23-25.