Former US Open champion Andy Roddick believes Jannik Sinner must work on his serve to get more positive results on the tour. Sinner has a solid serve but he struggled with his first serve in the US Open final against Carlos Alcaraz at the Arthur Ashe Stadium, New York on Sunday.

The Italian first serve was 48% in the New York Major final and he also committed four double faults against the Spaniard. After his loss, Sinner admitted his game was predictable and he wants to improve certain areas in his game. The Italian said he would work on serve and volley but Roddick said Sinner can only do that if he improves his first-serve percentage.

“The serve was as bad as it’s been probably in a year since they adjusted, and it massively improved,” he said on the Served with Andy Roddick podcast.

Roddick highlighted the biggest issue the Italian will have to work on if he wants to challenge Alcaraz. “Something wasn’t quite right with the serve,” continued the former World No. 1. “That’s number one.”

“He says serve and volley. It’s tough to serve and volley when you’re making 40 percent of your first serves,” explained Roddick. “That’s a tough one. It’s tough to commit and adjust and do all that.”

The American said Alcaraz didn’t let Sinner settle into his game plan and made him play out of his comfort zone.

“Carlos almost came out in the extreme and was saying: ‘I am going to slice, I am going to play up.’ There was no rhythm for Jannik,” explained Roddick in the same podcast.

“When Jannik gets into where he can click, click, click, click, click. He becomes a robot. He didn’t let him get into that thing where he knew what was coming.”

“Maybe Jannik has to be a bit of a psycho at the beginning of matches. Maybe he has to throw in some serve and volleys,” concluded Roddick.

Sinner would look to come up with a solution and would definitely work on his game.