Kyrgios withdraws from Atlanta tournament
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The Australian was scheduled to face German Peter Gojowczyk on Tuesday, but withdrew from the tournament following an earlier doubles win alongside compatriot Thanasi Kokkinakis.
"I'm shattered that I'm not able to compete tonight," Kyrgios told the crowd.
"I'm going to keep my hopes up and maybe be able to continue doubles with Thanasi this week."
Kyrgios, ranked 47th in the world after Wimbledon was stripped of its ranking points for banning Russian and Belarusian players, could return in Cincinnati after receiving a wildcard for the Masters tournament which starts on August 13.