"I could win and still not make it, so from that standpoint it's not in my power", Federer said.
The subject had been raised by Julien Benneteau, a former Davis Cup player for France, who told Radio Monte Carlo that there was something "disturbing" about the way Federer has a business relationship with Tennis Australia - an investor in his Laver Cup exhibition event - while also being granted the cooler evening slot every time he plays in Melbourne. Federer skipped practice yesterday for a second time this week in a bid to keep his mental welfare in order.
"I was not feeling good to play such a match in front of such a big crowd and everything".
Federer snagged his first service break in the third game of the match and never looked back.
The Japanese world number nine looked poised to end the season on a high after taking the scalp of six-time victor Federer in their opening round-robin match at London's 02 Arena.
Earlier in the day, Anderson blasted his way to a 6-0, 6-1 win over Kai Nishikori to claim his second win of the ATP Finals.More news: Jennie-O Recalling Ground Turkey Amid Widespread Salmonella Outbreak
The Austrian played a poor game subsequently though, making four forehand unforced errors and gifting the break advantage to Federer.
Another break followed in the seventh game as Thiem netted a tame volley as Federer won the first set easily.
"I don't know what happened against Nishikori. He has had a wonderful season and played great against me at Wimbledon".
A Federer backhand up the line set up match point and Thiem's 34th unforced error - another volley into the net - 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. "But I was able to settle very quickly and find a really good rhythm, taking care of my serve games nicely, created quite a few opportunities on his serve."World number one Novak Djokovic, who heads the Guga Kuerten group, will be in action on Monday against John Isner while Alexander Zverev takes on Marin Cilic". His renaissance peaked when he handed former ATP Finals champion Federer his first straight sets defeat in the group stage of the tournament.
Nishikori's chances remain decent, particularly if he can secure a straight sets win, although his heavy defeat to Anderson could play a major role should it come down to percentage of games won.