Nick Kyrgios is a genius in underarm service tactics, says Judy Murray



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Kyrgios to face Croatian Borna Coric in Miami last match 16

The controversial Australian Nick Kyrgios has been described as "genius" by the former British Fed Cup captain, Judy Murray, who is "surprised", no other player follows his example.

He comes after World No. 33 Kyrgios, 23, who served twice under arms in his 6-3 6-1 defeat of Serbian Dusan Lajovic at the Miami Open on Monday.

A spectator was ejected after a mid-match fight with Kyrgios.

"Underarms serve," Murray writes Twitter