Stefanos Tsitsipas (6), Greece, def. Roger Federer (3), Switzerland, 6-3, 6-4.
Dominic Thiem (5), Austria, def. Alexander Zverev (7), Germany, 7-5, 6-3.
Michael Venus, New Zealand, and Raven Klaasen (5), South Africa, def. Robert Farah and Juan Sebastian Cabal (1), Colombia, 6-7 (5), 7-6 (10), 10-6.
Nicolas Mahut and Pierre-Hugues Herbert (7), France, def. Lukasz Kubot, Poland, and Marcelo Melo (2), Brazil, 6-3, 7-6 (4).Saturday
At The O2 Arena
Surface: Hardcourt indoor
LONDON (AP) _ Results Saturday from World Tour Finals Singles at The O2 Arena (seedings in parentheses):
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