Roger Federer backs Jannik Sinner as the world's best men's tennis player.

Roger Federer weighed in on the debate over the world’s best men’s tennis player, favoring Jannik Sinner because of his dominant season before a knee injury sidelined him. Federer said a fully fit Carlos Alcaraz could have the strongest claim at his peak, while Alexander Zverev’s breakthrough season also puts him in contention. Alcaraz, meanwhile, called Zverev probably the best player right now ahead of the Laver Cup, as Sinner recovers and Alcaraz returns from injury.
Zverev has not beaten either Alcaraz or Sinner in 2026, and Sinner won all five of his meetings with Zverev, including the Madrid and Wimbledon finals.
Although Zverev is ranked No. 2 with 9,690 points, he is 1,810 points behind Sinner; he has only 1,080 points to defend for the rest of the season, compared with Sinner’s 3,550.
Sinner had a 44–3 win-loss record before his knee injury forced him out of the US Open and the Laver Cup.
Federer also recognized Zverev’s long-awaited breakthrough, saying he was “finally where we all hoped he would be one day as being a Grand Slam champion.”
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