From the moment Anderson broke his opponent in the second game, it was one way traffic, with the volume of Anderson's fearsome groundstrokes matched only by Nishikori's unforced errors.
"It feels good and I am very happy, no game is easy here and I am not used to losing and coming back again, but it was a good challenge and I am happy with the way I played", said Federer after the match.
"He was hitting the ball really well and it was making me impatient". I just see somebody across the net who's feeling it right now. "He played well, but something was wrong".
Federer will face South African Anderson in their final group match on Thursday. "I've got to fix it and try to be positive for next one".
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Polling suggests the Republican coalition is increasingly older, whiter, more male and less likely to have a college degree. But Brookings Institution expert John Hudak said it is also clear that Trump is a major issue for both parties this year.
If Federer looked bad-tempered and off his game in losing to Kai Nishikori on Sunday, Tuesday saw the return of the calm and controlled Federer, who was totally in control of his game.
Meanwhile, world No. 1 Novak Djokovic edged closer to securing a place in the last four of the ATP Finals after defeating Germany's Alexander Zverev 6-4, 6-1 yesterday.
But Nishikori seemed to have nothing left after that effort. Novak Djokovic asks Roger Federer question at ATP Finals Novak Djokovic defends youngsters after Federer and Anderson humblings However, even if the 20-time Grand Slam victor does record a comfortable victory, progression would then go down to the percentage of games won between those also tied on two wins.
The second set was more of the same as Anderson kept dictating the play while Nishikori continued to struggle on serve.
The ATP Finals is contested by the eight players who have accumulated the most ranking points over the season separated into two groups, with the best four players reaching the knockout semi-finals stage.
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Gerard Butler posts image of Malibu home burned in wildfire
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Marijuana expands into three more states
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Early voting sets record in IL
Louis County, 253 people who recently registered to vote were mistakenly sent letters telling them they were ineligible. More than 16 percent of voters to date have Spanish surnames, a higher share than in any previous midterm election.