Rafael Nadal showed no signs of back trouble in a 6-3 7-5 first-round win over Daniel Gimeno-Traver in Rio de Janeiro.
Marin Cilic ousted second seed Andy Murray 6-3 6-4 to book a semi-final spot at the ATP Rotterdam event.
Top seed David Ferrer booked a place in the second round of the Copa Claro with a hard-fought 7-6(7) 6-4 opening win over Maximo Gonzalez.
France and Switzerland gained unassailable 3-0 leads in the Davis Cup whilst Serbia were dumped out.
Round-up: Roger Federer and Stanislas Wawrinka gave Switzerland a 2-0 lead over last year's runners-up Serbia in the Davis Cup.
Round-up: The Australian Open ended early for John Isner after the American number one retired from his match against Martin Klizan.
First round draw for the men's singles after qualifying at the Australian Open.
The father of Bernard Tomic may be banned from the Australian Open but it did not stop him cheering on his son in Sydney.
ATP World Tour Finals
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