Roger Federer said he had no more margin for error if he wanted to avoid an early exit at the ATP Finals after losing his opening group match to Dominic Thiem on Sunday.
The 38-year-old Swiss, bidding for his seventh title at the event but his first since 2011, struggled to handle Thiem’s aggressive game as he went down 7-5 7-5.
“My forecast, it’s a normal tournament from here on forward,” 20-time Grand Slam champion Federer, beaten by Djokovic in an epic Wimbledon final in July, said.
“Not allowed to lose anymore for me. That’s how it is every week of the year for the last 20 years, so from that standpoint there is nothing new there.
“I’ve got to recover, I’ve got make sure I play better than today, and hopefully I can win that match (against Berrettini).”