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World number one Simona Halep fought back from a set down to defeat France's Oceane Dodin in the second round of the Miami Open.

The 26-year-old Romanian beat the world number 98 in three sets - 3-6 6-3 7-5.

Halep received treatment on her neck twice during the match and eventually rallied to win in two hours and seven minutes.

She will face Agnieszka Radwanska next after the Pole beat Alison Van Uytvanck of Belgium 6-3 7-6 (7-4).

German 10th seed Angelique Kerber breezed past Sweden's Johanna Larsson 6-2 6-2, while Czech Karolina Pliskova beat Ekaterina Makarova of Russia 7-5 7-5.

Victoria Azarenka also progressed to the third round after US Open finalist Madison Keys was forced to retire with an injury.

In the women's doubles, British duo Heather Watson and Johanna Konta reached the second round with a 6-2 4-6 10-3 win over America's Nicole Melichar and Czech Kveta Peschke.

Halep, who reached the semi-finals in Indian Wells last week, created two break opportunities in the opening game.

She was unable to take advantage and it was Dodin who got the first break of the match as a Halep backhand drifted out.

Halep broke back straight away but looked below par, and she was broken at 4-2 before the Frenchwoman served out the set at the third attempt.

A trainer was called for Halep during the changeover as she struggled with her neck, and again after Dodin broke back to level the second set.

She came out on top in a scrappy second set but received a warning in the third set when, trailing 2-1 and facing a break point, she threw her racquet to the ground in frustration.

A break in the 11th game of the final set was enough for Halep to secure victory, while Dodin was left to rue 16 double faults.

Three-time winner Azarenka was up by a set and a break when a leg problem became too much for Keys.

Azarenka, who has seen her ranking fall to 186th, will play Anastasija Sevastova in the third round after the Latvian beat Alize Cornet of France 7-5 6-4.

British number one Kyle Edmund and Serbian partner Nenad Zimonjic were knocked out of the men's doubles first round 6-4 7-6 by Americans John Isner and Donald Young.

Edmund faces another American, 20-year-old Frances Tiafoe, in the men's singles second round.