Li Na, 2014 Australian Open

Jason Reed/Reuters

Chinese trailblazer Li Na retires at age of 32

Asia's first grand slam singles champion Li Na has called time on her 15-year tennis career due to "chronic" knee injuries.

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Gregg Wavrunek

WKBT, News8000.com

Gregg Wavrunek

Gregg Wavrunek is the Sports Director at WKBT-TV.