Roger Federer beat Rafael Nadal in a thrilling five–set Australian Open final on Sunday, and Twitter went wild.
Federer's victory marked his 18th Grand Slam title, the most of all–time. Federer, 35, hadn't won a Slam since Wimbledon in 2012.
Nadal has dominated his rivalry with Federer, but Federer avenged his 2009 Australian Open final defeat to Nadal on Sunday.
Here's a look at some of the best Twitter reactions to Federer's victory, both within the tennis community and elsewhere.
Federer has now won five Australian Open titles.