MALAGA, Spain — Jannik Sinner was in the locker room, getting ready to go on court and try to win a match that would give Italy its second Davis Cup title in a row, when his teammate, Matteo Berrettini, was asked about being so close to a championship.
Berrettini, who won the first match of the best-of-three final against the Netherlands on Sunday, refused to take anything for granted.
''I know tennis,'' he said. ''It's unpredictable.''
Maybe most of the time it is. Not lately, though. Not when Sinner, who is just 23, is the one swinging a racket. He simply does not lose matches. Doesn't even cede a set nowadays. Wrapping up an eventful season that featured a 73-6 record and eight individual titles — including at the Australian Open in January, the U.S. Open in September and the ATP Finals a week ago — Sinner led Italy past the Netherlands for the Davis Cup with a 7-6 (2), 6-2 victory over Tallon Griekspoor.
''Jannik in this kind of form, this kind of shape, this kind of confidence — he's incredibly tough to beat,'' Griekspoor said.
Consider that Sinner just completed the first season by a man without a straight-set loss since Roger Federer in 2005. And what a way to finish: Sinner won his last 14 matches and his last 26 sets.
Go back a little further, and he's claimed 29 of his past 30 contests, with the only loss in that span coming against the other young player at the top of men's tennis, four-time major champion Carlos Alcaraz, who is 21.
''He just proved,'' Berrettini said about Sinner, ''that he's the best in the world.''