When Carlos Alcaraz is on court for a training session, perhaps working on his newly revamped service motion, he's doing so to buttress a game already good enough to claim four Grand Slam titles.

Alcaraz won the French Open and Wimbledon titles last year while Sinner claimed the Australian Open and U.S. Open trophies.

MELBOURNE – Carlos Alcaraz said on Jan 11 that his burgeoning rivalry with Jannik Sinner brought out the best in him, with the Spanish star driven by winning more Grand Slam titles and toppling the Italian as world No. 1.