The second-seeded former world No. 1 Nadal handled 16th-seeded rising Japanese
Kei Nishikori 6-4, 6-4 in 2 hours, 10 minutes at Crandon Park. The Spanish
great moved on with the help of four service breaks, compared to only two for
a game Nishikori.
Nadal lost to current world No. 1 Novak Djokovic in last year's Miami finale
and also finished as the runner-up here in 2005 and 2008.
The 10-time major champion Nadal, who owns a record-tying 19 Masters titles,
will face sixth-seeded Frenchman Jo-Wilfried Tsonga or 19th-seeded German
Florian Mayer in the quarterfinals.
Nadal is seeking his first title anywhere since capturing the French Open last
Eighth-seeded American Mardy Fish snuck into the quarters with a 6-3, 6-7
(2-7), 6-3 victory over 12th-seeded Spanish clay-court stalwart Nicolas
Almagro. Fish prevailed in 2 hours, 35 minutes.
Ninth-seeded Serb Janko Tipsarevic also reached the round of eight by getting
past talented 20-year-old Bulgarian Grigor Dimitrov 7-6 (7-3), 6-2 on Day 7.
The 2012 Miami champion will collect $659,775.