MELBOURNE, Australia -- 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, and so did the double-faults and break points, often followed by a palm placed over her eyes or a slap to a thigh.

Paula Badosa said that during her struggle with injuries, she contemplated retiring from tennis. On Tuesday, the Spaniard booked her maiden semi-final berth in a grand slam after beating Coco Gauff in straight sets and will return to the top 10 of the WTA rankings.

Paula Badosa thought she might retire due to a back injury. A year later, she's in to the semifinals against close friend Aryna Sabalenka.

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.

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

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 lost to Spain’s Paula Badosa on Tuesday in the Australian Open. After back problems that saw her fall in the rankings from No. 2 to No. 140, the Spanish player’s determination halted Gauff’s hot streak.