Tennis - ATP Finals - The O2, London, Britain - November 15, 2018 Switzerland's Roger Federer celebrates winning his group stage match against South Africa's Kevin Anderson Action Images via Reuters/Andrew Couldridge
LONDON (Reuters) - A few days after it appeared as though a Roger Federer impersonator had gatecrashed the 02 Arena, the Swiss great resumed normal service to outplay Kevin Anderson and reach the last four of the ATP Finals on Thursday.
Federer walked out into a jam-packed O2 Arena knowing any repeat of his insipid performance on Sunday against Japan's Kei Nishikori could have resulted in an ignominious early exit.
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