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Nick Kyrgios, of Australia, returns a shot to Andy Murray, of Britain, during the first round of the U.S. Open tennis tournament in New York, Tuesday, Sept. 1, 2015. (AP Photo/Julio Cortez)

KUALA LUMPUR, Malaysia (AP) Seventh seed Nick Kyrgios of Australia is through to the second round of the Malaysian Open after Colombian Santiago Giraldo retired with injury when losing 6-1, 2-1 on Monday.

It is Kyrgios' first tournament since he lost to Andy Murray in the first round of the US Open earlier this month.

Last year Kyrgios lost in the opening round of the Malaysian Open with a bone stress injury to his left forearm and underwent rehabilitation in Melbourne.

In the day's other first round match, Germany's Benjamin Becker knocked out Kyrgios' countryman Sam Groth 6-1, 7-6 (6).

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