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.
Britain's Dan Evans was knocked out of the ATP Marseille Open by Ukraine's Sergiy Stakhovsky.
Marin Cilic ousted second seed Andy Murray 6-3 6-4 to book a semi-final spot at the ATP Rotterdam event.
ATP round-up: Andy Murray dropped a set on his way to a 6-4 3-6 6-3 win over Dominic Thiem in the second round in Rotterdam.
Round-up: Andy Murray eased into round two of the ABN Amro World Tennis Tournament after beating Edouard Roger-Vasselin 6-3 6-3.
Britain's Dan Evans has made the the quarter-finals of an ATP event for the first time at the Zagreb Indoors.
Juan Martin del Potro continued his build-up to the Australian Open by reaching the semi of the Sydney International.
Spaniard Nicolas Almagro, seeded 13th in the men's draw, has pulled out of the Australian Open due to a shoulder injury.
List of men's seeds for the Australian Open which begins on Monday:
The Czech Republic won their second successive Davis Cup title after Radek Stepanek beat Dusan Lajovic 6-3 6-1 6-1.
Round-up: Rafa Nadal broke the resistance of Jerzy Janowicz's to win 7-5 6-4 and reach the last eight of the Paris Masters.
Swiss Stanislas Wawrinka and France's Richard Gasquet snatched the last two places for next week's ATP World Tour finals.
Stanislas Wawrinka beat Feliciano Lopez 6-3 3-6 6-3 at the Paris Masters to end Nicolas Almagro's World Tour Finals chances.
Stanislas Wawrinka remains on track for a spot in the ATP World Tour finals by seeing off Spain's Feliciano Lopez 6-3 3-6 6-3.
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