MIAMI, March 225 — It took Coco Gauff a while to wake up on Sunday but when she did it was lights out for Oceane Dodin as the American third seed stormed back from 4-2 down to earn a 6-4 6-0 win and a place in the Miami Open fourth round.

Gauff sleepwalked through much of the opening set in the first match on Hard Rock Stadium court, but when the alarm went off the US Open champion swept 10 straight games to stun the French lucky loser.