Austria's Dominic Thiem beat Swizerland's Roger Federer for the third time this year on Sunday, downing him 7-5, 7-5 in the debut match for both players at this year's ATP Finals in London.

In a Group Bjorn Borg match, Thiem bested the six-time tourney champion in 100 minutes, exacting revenge for the 6-2, 6-3 defeat that the former world No. 1 had dealt him in this same tourney last year in the group stage.