Swiss tennis legend Roger Federer hailed Novak Djokovic for his historic 23rd Grand Slam title, saying the Serbian still looks young on the court and will continue to win major titles.

With a legendary career that spanned several years, Federer secured an impressive 20 major titles before his retirement last year. But he has since been overtaken by both Rafael Nadal (22) and Djokovic. Djokovic surpassed Federer’s 22 majors record at Wimbledon last year. He then equalled Nadal’s 22 grand slams by winning Australian Open back in January, before moving to 23 with a straight-sets win over Casper Ruud on Sunday at the French Open.