Kyrgios booed after retiring while trailing

FLORIDA: Controversies continued to plague Australian Nick Kyrgios, who retired with a shoulder injury while trailing 3-6, 0-3 to American Tenny Sandgren at the Citi Open in Washington and left the court to a chorus of boos.

It marked the third successive tournament in which the 22-year-old retired during a match.

Kyrgios, playing his first tournament since he retired in the first round of Wimbledon due to a chronic hip injury, said mental problems and physical struggles had hurt his preparations.

"Just struggling, mentally, physically," said Kyrgios later.

He had called out the medical trainer for treatment on his shoulder before retiring and looked in obvious discomfort.

Kyrgios was playing in the second round after receiving an opening round bye and was seeded to play Germany's Alexander Zverev in a keenly anticipated third-round match.

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