TURIN, Italy (AFP) — Carlos Alcaraz opened his account at the ATP Finals with an entertaining 6-3, 7-6 (10/8) win over Andrey Rublev while Casper Ruud missed an early chance to reach the semifinals after losing in straight sets to Alexander Zverev.

World No. 3 Alcaraz comfortably defeated Rublev to lift himself off the bottom of the John Newcombe Group and looked in much better form despite struggling with fatigue and illness in the lead-up to the match.

There had been some doubt as to whether Alcaraz, who lost his opening match in straight sets to Ruud, would continue in Turin after quickly ending his training session on Tuesday, with his coach Juan Carlos Ferrero saying that he had trouble breathing.

“I could be better, I’m not going to lie,” said Alcaraz on court after beating Rublev.

“I’ve been struggling with my health the last week and today I thought I was going to feel better. I was okay to play but thinking about the first match I was thinking a lot about that I was sick, that I couldn’t play.”

“Today, I really wanted to step on the court and just think about tennis, try to play at a high level. When I played the first match I felt like I did not entertain the people, I did not play good tennis.”

Alcaraz, who has won the Wimbledon and French Open titles this season, cruised to the first set in 38 minutes, breaking Rublev in game seven and quickly winning the next two to go one set ahead.

And although the Spaniard had a harder time of it in the second set, he delighted the spectators with a series of spectacular shots which suggested he might be approaching his best form.

Rublev, meanwhile, dropped to last place after losing his sixth straight Finals match, although he put up a battle and had two opportunities to win the second set.

Alcaraz winning in straight sets meant that Ruud would have reached the semifinals with a match to spare if he had beaten two-time Finals champion Alexander Zverev in the day’s late match.