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Is an underarm serve really that effective for Nick Kyrgios? Maths professor finally reveals the truth - Tennishead
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This trio of women's tennis players uses underhand serves to their advantage | The Daily Pennsylvanian
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Nick Kyrgios: Andy Murray's mum Judy joins Miami Open underarm serve row - 'He's a GENIUS' | Tennis | Sport | Express.co.uk
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It's a circus!' - Nick Kyrgios sends fans wild with underarm-tweener serve and showboats at Australian Open - Eurosport
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