Kyrgios was due to face Taylor Fritz in Friday night's match but pulled out shortly before, sending his American opponent through to the semi-finals to face Canadian Denis Shapovalov.
The 27-year-old has had a terrific run of form in the second half of 2022 as he won the Citi Open in Washington and reached his first major final at Wimbledon and the U.S.
Open quarter-finals. "I've been playing amazing tennis all year and actually was dealing with a bit of a knee issue around the U.S.
Open time," world number 20 Kyrgios told reporters. "I got back home and probably didn't take enough time off, to be honest.
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