(AP Photo/Alastair Grant)

LONDON (AP) Sometimes no practice makes perfect - for Roger Federer anyway.

After cancelling his training session a day earlier, Federer produced a much-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.

Having lost his opening round-robin match to Kei Nishikori, 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.

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