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. He's also got his young rival,

The men's world No. 1 could face a two-year ban. Here's what to know about the doping proceedings against him so far

Four-times Grand Slam champion Carlos Alcaraz said having a rival like world number one Jannik Sinner was good for his game as it pushes him to be at his best every time he walks on court.