Brydan Klein went down 7-6 6-3 to 19-year old Mathias Bourgue at the qualifiers for the French Open in Roland Garros.
Novak Djokovic and Roger Federer both got their clay-court seasons back on track with straight sets wins at the Rome Masters.
Top seed Nicolas Almagro fought back to beat Frenchman Gael Monfils 2-6 6-0 6-3 at the US Men's Clay Court Championship.
John Isner prevailed in an all-American battle with Ryan Harrison to kick off his ATP Houston campaign on a winning note.
Rafael Nadal continued his return to action with a 6-2 6-2 win over Diego Schwartzman iat the Acapulco International.
Round-up: World number 10 Richard Gasquet was dumped out of ATP Marseille in the opening round.
Rafael Nadal came from a set down to book a place in the semi-finals of the Brazil Open with victory over Carlos Berlocq.
Rafael Nadal continued his comeback from a serious knee injury with a 6-3 6-4 win over Joao Souza at the Brazil Open.
Juan Martin Del Potro got his World Indoor Tournament under way with a 6-3 6-4 win over Gael Monfils in Rotterdam.
Round-up: Janko Tipsarevic's campaign at the Open Sud de France ended with defeat to Michael Llodra in the second round.
Jan 15 (Infostrada Sports) - Results from the Australian Open Men's Singles Round 1 matches on Tuesday Ivan Dodig (Croatia) beat Wu Di (China) 7-5 4-6 6-3 6-3
Jan 15 (Infostrada Sports) - Results from the Australian Open Men's Singles Round 1 matches on Tuesday 14-Gilles Simon (France) beat Filippo Volandri (Italy)
MELBOURNE, Jan 11 (Reuters) - Australian Open men's singles draw released on Friday (prefix denotes seeding; w-indicates wild card): 1
ATP round-up: Juan Carlos Ferrero's singles career came to an emotional end when he lost 7-5 6-3 to Nicolas Almagro in the Valencia Open first round.
Round-up: Roger Federer began his quest for a sixth US Open title with a stylish 6-3 6-2 6-4 victory over American Donald Young.
ATP World Tour Finals
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