Kiwi tennis doubles specialist Erin Routliffe is confident she's at peak fitness for this evening's mixed doubles semi-final at the Australian Open, despite a demanding schedule.

The 29-year-old says it's been physically fine making the final four in both the mixed and women's doubles - with fellow Kiwi Michael Venus and Canadian partner Gabby Dabrowski - she just has to remember which side of the court she's supposed to be on!

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