Roger Federer and Novak Djokovic made convincing starts to their Miami Masters campaigns, just days after facing off in the Indian Wells final.
Federer, a two-time winner in Florida, ousted towering Ivo Karlovic 6-4 7-6 (7-4), while his conqueror in California, second-seeded Djokovic, saw off Jeremy Chardy 6-4 6-3.
Chardy had delayed the inevitable ahead of the final game, taking a medical timeout after hobbling to a courtside tunnel with an ankle problem.
But Djokovic, who had lambasted the umpire over a time violation in the first set, fired down three aces in the concluding game to end the Frenchman's travails.
After a year's absence from the Miami hardcourts, Federer got the better of ace-specialist Karlovic in just 75 minutes to book a third-round date with Fernando Verdasco or Thiemo de Bakker.
The former world No 1 did the damage with his own serve, winning 95 per cent of points on his first delivery and 92 per cent on his second, before edging a second-set tie-break.
"I made sure I had a lot of first serves in, made sure I stayed aggressive from the baseline," Federer said. "I think it worked really well, hardly any unforced errors.
"I was able to move Ivo around and I was able to maintain that throughout the match, which was key. I could focus a bit on returning while then holding serve, which is important against Ivo."
Fourth seed David Ferrer was also victorious, seeing off Teymuraz Gabashvili 6-4 6-0, while ninth-ranked Richard Gasquet got the better of Alejandro Gonzalez 7-6 (9/7) 7-4 in their first career meeting.
Tommy Robredo was too good for the rising Dominic Thiem, winning 6-4 7-6, while Grigor Dimitrov went through three sets before getting past Albert Montanes 6-1 7-6 (7/5) 6-3.
Elsewhere in the men's draw, Feliciano Lopez recorded a 6-2 7-6 (7/3) win over Jiri Veseley and Florian Mayer dropped five games in a 6-3 6-2 success against Ivan Dodig. Meanwhile, Kenny Anderson was a 6-4 6-3 winner against Horacio Zeballos.