Nick Kyrgios in doubt for Wimbledon after Halle Open withdrawal

Nick Kyrgios has suffered a further setback in his preparation for a grand slam return at Wimbledon. Photo: AAP

Nick Kyrgios has withdrawn from this week’s Halle Open grasscourt tournament, putting a major question mark over his fitness to compete at Wimbledon.

The Australian, who reached last year’s final at Wimbledon, was announced on Monday as a non-starter in the German warm-up event, with his long-standing knee injury cited as the reason by the ATP.