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 and former World No.2 Paula Badosa defeated No.3 seed Coco Gauff in straight sets in the quarterfinals of the Australian Open to reach a Grand Slam semifinal for the first time.

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.