As the tennis world wakes up to the news of the 22-time Grand Slam winner's impending retirement, here's what Carlos Alcaraz, Jannik Sinner, Iga Swiatek and more had to say.

"No better way to use my off-season," wrote the former world No. 4 on social media.

The former world No. 4 addressed a “toxic mindset” that she believes derailed her year, opting to forgo the Asian Swing and return in January for the Australian hard courts.