Britain's Johanna Konta began her Miami Open title defence with a second-round win over Belgium's Kirsten Flipkens.
Konta, ranked 14th in the world, registered a 6-4 6-3 victory over the world number 71 in 84 minutes.
The 11th seed, who had a bye in the first round, looked composed as she hit eight aces and 27 winners on her way to victory.
She will face either Germany's 22nd seed Elise Mertens or American Bernarda Pera in the third round.
Elsewhere, Czech Petra Kvitova beat Belarusian Aryna Sabalenka 7-5 3-6 6-3, and Ukraine's Elina Svitolina knocked out Indian Wells champion Naomi Osaka.