Roger Federer (3), Switzerland, def. Matteo Berrettini (8), Italy, 7-6 (2), 6-3.
Dominic Thiem (5), Austria, def. Novak Djokovic (2), Serbia, 6-7 (5), 6-3, 7-6 (5).
Rajeev Ram, United States, and Joe Salisbury (4), Britain, def. Ivan Dodig, Croatia, and Filip Polasek (8), Slovakia, 3-6, 6-3, 10-6.
Michael Venus, New Zealand, and Raven Klaasen (5), South Africa, def. Lukasz Kubot, Poland, and Marcelo Melo (2), Brazil, 6-3, 6-4.Tuesday
At The O2 Arena
Surface: Hardcourt indoor
LONDON (AP) _ Results Tuesday from World Tour Finals Singles at The O2 Arena (seedings in parentheses):
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