US Open: Coco Gauff overcomes service struggles for dramatic 1st-round win over Ajla Tomljanović in first match since coaching change

Naomi Osaka rolled to a quick win in her first-round match on Tuesday night, too

Coco Gauff's service game wasn't perfect.

But it was good enough on Tuesday in a dramatic 6-4, 6-7 (7-2), 7-5 win over Australia's Ajla Tomljanović in the first round of the US Open.

The match was the first for Gauff since she dismissed grip specialist Matt Daly from her coaching staff and replaced him with renowned biomechanics specialist Gavin MacMillan last week to work on her serve, just days before the start of a Grand Slam tournament.

By Jason Owens

Full story at Yahoo News