Nick Kyrgios has lost his second-round clash to Radu Albot at the Delray Beach Open in a match marred by more on-court antics by the Australian.

Struggling with an apparent knee injury, Kyrgios was sent packing from the ATP event in Florida after suffering a 6-2 3-6 6-3 loss to the Moldovan in an hour and 26 minutes.

The Australian world No.64 snapped back at a spectator who apparently questioned his effort, attempted an inside-out serve on set point and later danced to Michael Jackson’s Smooth Criminal at the change of ends.