Coco Gauff's retooled forehand and serve abandoned her in the worst way and at the worst time at the Australian Open. The unforced errors just kept accumulating Tuesday, and so did the double-faults and break points,

Coco Gauff’s retooled forehand and serve abandoned her in the worst way and at the worst time at the Australian Open.

Coco Gauff of the U.S. reacts during her quarterfinal match against Paula Badosa of Spain during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan.

No. 11 seed Paula Badosa of Spain upset American Coco Gauff, the No. 3 seed, in straight sets at the Australian Open quarterfinals.

Coco Gauff’s fast start to the year came to an end at the Australian Open as she fell to a 7-5, 6-4 quarterfinal defeat against Paula Badosa.

Paula Badosa stunned Coco Gauff to reach her first Grand Slam semi-final and Alexander Zverev overcame Tommy Paul to book his ninth as the Australian Open awaited the blockbuster Tuesday evening clash between Novak Djokovic and Carlos Alcaraz.