Losers of the ATP Finals opening matches – Roger Federer and Dominic Thiem – will face each other on Tuesday evening.
While Thiem’s a straight-set defeat won’t have come as the unexpected surprise, the way of Federer’s loss was simply unpredictable.
The 37-year-old Swiss had never before lost any of his previous 45 round-robin matches in straight sets, but he seemed to be powerless to show his best form against Kei Nishikori.
Federer cancelled a practice session on Monday, prompting talks about his physical condition, although the organizers of the ATP Finals are confident that he is not going to leave the tournament.
Thiem failed to make a breakthrough against Wimbledon finalist Anderson, but he will hope to continue in a similar vein to his performance.
The world No 1, Novak Djokovic, is a favorite of the tournament, raising his chances for success after an impressive win against John Isner on Monday.
The latest ATP Finals odds from top bookmakers: