Ukrainian’s Marta Kostyuk raised eyebrows at the Miami Open on Monday when she used an underarm serve on matchpoint to beat Russian Anna Blinkova and then walked off court without shaking her opponent’s hand.

World No. 29 Kostyuk entered the last 16 with a 6-2, 6-1 win over Blinkova, but soon had the Internet discussing the manner in which she finished the match.