Novak Djokovic beat Andy Murray for the seventh time in a row, inflicting a 7-6 (7-3), 4-6, 6-0 defeat on the Scot in Sunday's final of the Miami Masters.
Djokovic, the world number one, becomes the first man to complete the Indian Wells-Miami US title double for a third time in his career. The Serb won the same hardcourt events in 2011 and 2013.
"Winning the double again means a lot of positive things and contributes to my confidence," Djokovic said.
"I'm so tired now, and I really want to enjoy this win. I don't have much energy left. I've played a lot of matches. I need to rest for a week and then think about the clay season."
Djokovic took just over two and three-quarter hours to claim his third title in a season that he started with a trophy at the Australian Open.
"I always have belief," he said.
"It was frustrating at times against Andy. I was not feeling great at all on court. Andy made me work though even I'm sure he felt the same as I did. Overall it was a great battle, and I'm proud to have been a part of it."
Djokovic took control of the third set and ran Murray ragged on the way to victory with 28 winners and breaks on five of 18 occasions. Murray finished with 48 unforced errors but aced eight times.
Murray was barely able to move in the final set due to apparent fatigue, and Djokovic claimed a 25th match win this season and 36th all-time in Miami, where he won his fifth title.
Murray's loss will still move him up to third in the ATP rankings behind Djokovic and Federer.
Since his September 2013 back surgery, the Scot has lost his last 12 matches against top-three opponents. He last beat Djokovic in the 2013 Wimbledon final.
"Congratulations to Novak - I'm not quite at his level yet. I do feel that I'm getting closer," Murray said.
"I just have to keep working hard. I'm sorry I couldn't make more of a fight, but I was tired. My legs were heavy, and I couldn't push quite hard enough."
He called steamy Miami, where he owns a downtown flat, "a special place for me."
"I'm here three or four months of the year and do most of my training here," Murray said. "I love the city. Sorry I didn't get the job done in the final, but I'll be back next year to try again."
The early afternoon sun proved to be a problem for servers, with Murray giving up both of the breaks of serve he earned in the 67-minute opening set.
Though the Scot had played all of his matches at roughly the same hour, he seemed to have more trouble than an opponent which had been scheduled predominantly at night.
The set went into a tiebreaker, were Djokovic took a 4-0 lead before Murray could react. Murray netted a forehand to trail 5-2 and netted a forehand to give Djokovic three set points.
One was sufficient thanks to a Murray backhand error.
In the second set Murray was forced to save four break points to hang on for 2-1, as the set proceeded on serve, with Djokovic nailing a backhand winner to the corner for 3-all.
Murray took advantage of a loose service game from Djokovic, who found himself facing three Murray set points in the seventh game and lost the set to stand level after more than two hours on court.
