Since returning from his six month injury lay-off, the 35-year-old Federer has also won the Australian Open and Indian Wells and he heads into a self-imposed break before the French Open as, once again, the dominant presence on the ATP Tour.
The Swiss maestro, who also topped the Spaniard in Indian Wells a few days back, broke the Nadal serve once in each set, which sent him on his way to a 6-3, 6-4 victory in an hour and 34 minutes.
"I'm happy we're both here together, and I enjoy playing against you", Federer said, upon receiving his trophy and winners' check for just over $1 million. You were a little boy then and now you're a big, strong man. "It should be really exciting because we had this epic match [here] in 2005, the finals; it was unbelievable".
"I truly believe you are going to still win this tournament".
"You are too good not to win this one, so all the best for the coming years, of course".
"I want to stay healthy", Federer said. "It's been a very good two weeks for me".
Nadal has now lost four straight to Federer.
"To all the Latins here, thanks for all the love and support when I play here in Miami".
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Nadal, 30, has now suffered five defeats in the finals in Miami as he continues to chase an elusive first title there.
Fourth seed Federer, in his 24th career final against Nadal, started slowly, struggling to hold serve in the very first game, but he staved off two break points and settled into a good serving rhythm.
"When I am not feeling this good there is no chance I will be in the finals competing with Rafa", added the 18-time Grand Slam victor after his hard court win.
Nadal put some early pressure on the Federer serve, carving out two break points in the opening game but the 18-time Grand Slam victor held firm.
Roger and Rafa's legendary rivalry has been rekindled since the start of the year, with the pair producing some spectacular tennis against each other - particularly in the Australian Open.
'Keep going and the clay courts are just round the corner so I'm sure you'll tear it to pieces over there'.
"Wimbledon has to be the biggest goal now", said Federer, who plans to play no clay-court events apart from the French Open at the end of May. "What a start to the year, thank you to my team and all who have supported me, especially in my more hard challenging times last year".
"It's disappointing for me that I am trying during all my career", Nadal told the crowd with a smile during the trophy ceremony.