Who has the better shot at completing the Career Grand Slam first between Jannik Sinner and Carlos Alcaraz ? John Isner has backed the latter to do it first.

Sinner lifted both the hardcourt Majors, the Australian Open and the US Open last year, and denied the Spaniard a three-peat at Wimbledon this year. The Italian came close to winning the French Open but couldn’t cross the final hurdle in the form of Alcaraz, who defended his crown.

Alcaraz has won two titles each at the French Open, Wimbledon, and the US Open, but has never reached the semifinals of the Australian Open. He is a two-time quarterfinalist in the Major Down Under, also reaching the stage this year, but ended up losing the match in four sets to Novak Djokovic .

Clay is Sinner’s least favorite surface, and al

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