Coco Gauff got through a tricky first round to move on at the US Open.

She went up against Ajla Tomljanović, who didn’t make things easy for her. The Australian pushed Gauff all the way in their opening match. Gauff eventually edged it, coming through 6-4 6-7 7-5.

READ MORE: Serena Williams’ ex-coach shares his view on Coco Gauff’s controversial pre-US Open decision

The American has brought in a biomechanics specialist to help sort out her serve, which has been a problem throughout the North American hard-court swing.

Rick Macci backs Coco Gauff to have WTA’s top serve

Coco Gauff has found it tough to regain momentum since her French Open win, exiting Wimbledon in the first round and bowing out early at both the Canadian Open and Cincinnati Open.

She recently brought in Gavin MacMi

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