Carlos Alcaraz was put on a US Open collision course with Novak Djokovic on Thursday as the draw for the men's and women's singles tournaments were revealed.

World number one Jannik Sinner, who was forced to retire during the final of the Cincinnati Open, and playing partner Katerina Siniakova have withdrawn from the US Open mixed doubles draw, tournament organisers confirmed Tuesday.

Play was stopped briefly with Sinner leading 4-2 as the audio portion of the electronic line-calling system suddenly failed.

Carlos Alcaraz says he has refused to let his Wimbledon finals loss to Jannik Sinner wipe the smile from his face as he prepares for his start at the ATP-WTA Cincinnati Masters.

"Every time we play each other, I think our level is really high."

History suggests the grand finale on the hallowed lawns will be tight. Expect fire, finesse, and perhaps another five-set epic.

Top seed Jannik Sinner said he would not be in the Wimbledon final if he still harboured the hurt from his heart-breaking defeat by Carlos Alcaraz in the French Open final and believed Sunday's meeting would be different.

Novak Djokovic said the reality of his age was hitting him "like never before" after he was crushed by world number one Jannik Sinner in the Wimbledon semifinals on Friday.

Novak Djokovic set up a mouthwatering Wimbledon semi-final against world number one Jannik Sinner as he moved a step closer to claiming a historic 25th Grand Slam title.

Jannik Sinner overcame Ben Shelton in straight sets to reach the Wimbledon semi-finals for the second time on Wednesday, easing fears over an elbow injury he suffered in the previous round.

"I don't know what to say because he's an incredible player. I think we all saw this today," said Sinner.

The Italian three-time Grand Slam champion eased past his 52nd-ranked opponent 6-1, 6-3, 6-1.

While several of Wimbledon's top stars have suffered shock exits, including third seed Alexander Zverev and world number four Jack Draper, there has been no hint of an upset in Sinner's opening two matches.

"I'm very happy to come back here to such a special place for me," Sinner said.

Novak Djokovic admits Wimbledon offers him the "best chance" to make history as he chases a record-breaking 25th Grand Slam title in the twilight of his glittering career.

Carlos Alcaraz will start his Wimbledon defence against Fabio Fognini while world number one Jannik Sinner faces a potential semi-final clash against Novak Djokovic following Friday's draw.

Miami Open champion Jakub Mensik, 19, and 18-year-old Brazilian Joao Fonseca are two teenagers McEnroe could envision breaking into the Alcaraz-Sinner rivalry, as well as big-serving American Ben Shelton.

Defending champion Jannik Sinner lost his second-round match on grass at Halle on Thursday to Kazakhstan's Alexander Bublik, the Italian's first tournament since his French Open final defeat.

World number one Jannik Sinner rebounded from his agonising French Open final defeat to Carlos Alcaraz with a straight-sets win at the Halle Open on Tuesday.

Carlos Alcaraz will return to action at Queen's Club next week after the world number two celebrated his epic French Open triumph by partying in Ibiza.