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Switzerland's Roger Federer serves against Austria's Dominic Thiem during their men's singles round-robin match on Day 3 of the ATP World Tour Finals at O2 Arena in London on Nov. 13, 2018.GLYN KIRK/AFP/Getty Images

Roger Federer produced an improved performance to get his campaign for a seventh ATP Finals title back on track with a 6-2, 6-3 victory over Dominic Thiem on Tuesday.

The 20-time Grand Slam champion was still some way from his fluent best, but dropped just six points on serve and took advantage of a wayward display from Thiem to break twice in both sets.

Having lost his opening round-robin match to Kei Nishikori, Federer will likely need to defeat Kevin Anderson on Thursday to improve his 14-1 record of reaching the semi-finals at the season-ending tournament.

Anderson thrashed Nishikori 6-0, 6-1 to move to 2-0 earlier, with the lopsided scoreline all but assuring the South African debutant’s place in the last four.

Thiem is facing an opening-round exit at the O2 Arena for a third straight season and will need to defeat Nishikori to have any chance of progressing.

As had been the case in both players’ opening-match losses on Sunday, unforced errors flowed early on. While Federer was able to compensate with his serve, Thiem was left exposed.

The Austrian’s forehand gifted Federer a break for a 2-1 lead and then his volley came up short to help the Swiss star extend that advantage to 5-2.

Federer, who is chasing a 100th ATP Tour title, started to play more relaxed and seemed content with simply keeping the ball in play and waiting for mistakes. It worked, as another forehand mistake from Thiem put Federer in complete control in the second set.

A backhand up the line set up match point and another volley into the net from the French Open runner-up ended the day’s second one-sided contest.

The 32-year-old Anderson, who lost just eight points on serve, was on the verge of completing just the second whitewash in the competition’s history until Nishikori won the penultimate game.

“Among the best I’ve played,” Anderson said. “I think I did a really good job constantly applying the pressure and not letting up.”

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