NOVAK DJOKOVIC pulled a spare ball from his pocket, angrily whacked it against the backstop and then pounded his uncooperative racket into the concrete.

He lost his temper, but not the match. Annoyed after squandering a second-set lead, Djokovic regrouped and beat Federico Delbonis 7-5, 4-6, 6-1 Sunday in the third round of the Miami Open.

Djokovic appeared on his way to an easy victory when he led 3-1 in the second set, but he dropped serve twice in a row. He then steadied himself to win a succession of long rallies and sweep the last five games.

“We were very close in the beginning of the third set,” he said. “It could have gone a different way.”

The top-ranked Djokovic is trying for his seventh title at the Miami Open, which moved this year to the Dolphins’ complex.

On the women’s side, defending champion Sloane Stephens lost to Tatjana Maria 6-3, 6-2. Venus Williams, who is a three-time Miami champion but unseeded, beat No. 14 Daria Kasatkina 6-3, 6-1.

Defending men’s champion John Isner was broken in the first game but he held the rest of the way and hit 16 aces to beat Albert Ramos-Vinolas 7-5, 7-6 (6).

Isner, now 33, won the biggest title of his career in the tournament a year ago.

Seeded No. 7, he’ll next face No. 19 Kyle Edmund, who beat No. 12 Milos Raonic 6-4, 6-4.

(SD-Agencies)