The two best men's players in the world are reconfiguring the sport before their opponents' eyes. They don't know what to do about it

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,

Carlos Alcaraz has confessed that Jannik Sinner lives “in his head” when practising. The young champions have already formed an exciting rivalry and split the Grand Slams between them last year. They could now take it to the next level at the Australian Open, where they are on a collision course for their first Major final showdown.

The first round of the Australian Open continues on Monday at Melbourne Park where top seed and defending champion Jannik Sinner seeks a third Grand Slam title while Novak Djokovic begins his quest for a record-extending 25th major.

Italy's Jannik Sinner returns the ball to Netherlands' Tallon Griekspoor during the Davis Cup final tennis match between Netherlands and Italy at the Martin Carpena Sports Hall in Malaga, southern Spain, Sunday, Nov. 24, 2024. Credit: AP/Manu Fernandez

A new chapter of tennis history will be made at the Australian Open and here are the names who could enter the record books.