Hot but happy, Novak Djokovic had just begun celebrating his latest championship when he tossed his towel and sweatbands into the crowd. They were soggy souvenirs for sure.

Djokovic earned his fifth Key Biscayne title on Sunday, beating Andy Murray for the seventh consecutive time by showing superior stamina in the subtropical heat to win the Miami Open final 7-6 (3), 4-6, 6-0.

Murray broke in the final game of the second set to even the match but fatigue then became a factor on a sunny, humid, 80-degree afternoon.

Djokovic was the fitter player down the stretch.

"It was brutal - it's very warm," he said. "I was prepared for a physical battle. But it's one thing to prepare and another thing to experience it on the court. I was expecting very long rallies and just managed to play the third set the way I was supposed to, and I'm thrilled with this win."

The top-ranked Djokovic became the first man to complete the Indian Wells-Key Biscayne spring sweep three times, and he has done it twice in a row. He beat Murray in the Indian Wells semifinals and in the Australian Open final for his eighth Grand Slam title two months ago.

Murray fell to 8-18 against Djokovic.

"I'm not quite there with Novak yet but I feel like I'm getting a little closer," Murray said with a chuckle. "I'm sorry I couldn't make more of a fight of it in the third set. I was trying. My legs were tired and I couldn't quite finish hard enough."

Murray will climb from fourth to third in the new rankings but he has lost 12 consecutive matches to his biggest rivals - Djokovic, Rafael Nadal and Roger Federer - since winning Wimbledon in 2013 by beating Djokovic in the final.

Djokovic was inconsistent early in the tournament and let his frustration show, receiving two code violations and a point penalty during one win. He drew another code violation in the final for swearing after he lost the second set but he quickly regained his poise.

In the last set, Murray hit two weary backhands into the net to lose serve and fall behind 1-0. Two games later, he saved five break points before dumping another backhand into the net to go down 3-0 and Djoko-vic easily closed out the win.

Murray acknowledged his third-set shutout by tweeting, "This egg today wasn't appreciated on Easter."

Djokovic's fresher legs at the end of the 2 hr, 47 min match were especially impressive because Murray lives in Miami and is more accustomed to the Florida heat.

"I wasn't feeling great at all on the court," Djokovic said. "He was making me work. But he felt the same."

Murray conceded he wilted at the finish but said he trains as hard as he can.

"I don't think that I can do a whole lot more physically to get in much better shape," he said. "It's tough because it was obviously pretty brutal conditions out there and he was stronger than me at the end for sure."

Murray's consolation: He's getting married on Saturday in his hometown of Dunblane, Scotland. Djokovic won't be attending.

"Not invited," Djokovic said with a smile. "But I wish him all the best."

Martina Hingis and Sania Mirza won the title in the women's doubles by defeating Ekaterina Makarova and Elena Vesnina 7-5, 6-1.