Two-time defending champion Djokovic, trying to match Andre Agassi's record of six career Miami titles, needed only 78 minutes to win his 12th match in a row at the hard-court event and 26th in his past 27 Miami starts.
"That first set could have gone either way under armour scorpio ," Djokovic said. "I managed to hit the right balls at the right moment and make it to the finish."
The 28-year-old Serbian, who won his 11th Grand Slam crown at the Australian Open two months ago, also has crowns at Doha and Indian Wells this year and hopes to complete the Miami-Indian Wells sweep for the third consecutive year.
Djokovic's next foe will be Austrian 14th seed Dominic Thiem, who dispatched 124th-ranked Japanese qualifier Yoshihito Nishioka 6-2 http://www.underarmourshoeoutlet.com/ , 6-2 in 64 minutes.
Thiem captured his fifth career ATP title last month by beating Australia's Bernard Tomic in the Acapulco final and downed 14-time Grand Slam winner -Rafael -Nadal on the way to a Buenos Aires clay-court crown.
Sousa fell to 0-3 against Djokovic and 1-21 against top-10 foes with his 19th such loss in a row since beating David Ferrer in Kuala Lumpur in 2013.
Reigning Australian Open champion Angelique Kerber and Indian Wells -winner Victoria Azarenka, who each upset world No.1 Serena Williams in the final to win those titles, reached the last 16 on the women's side.
German second seed Kerber advanced 1-6, 6-2 cheap under armour shoes , 3-0 when 108th-ranked Dutch qualifier Kiki Bertens retired due to illness.
Kerber next faces Hungary's 49th-ranked Timea Babos, who ousted 18-year-old Japanese 104th-ranked wild card -Naomi Osaka 7-5, 6-0.
Eighth-ranked Azarenka, a 26-year-old from Belrus who won 2009 and 2011 -Miami titles under armour shoes outlet , eliminated Polish qualifier Magda Linette 6-3, 6-0.
She next faces last year's Wimbledon runner-up, Garbine Muguruza. The Spanish fourth seed ripped 74th-ranked US wild card Nicole Gibbs 6-1, 6-0 in 55 minutes.
Two-time Australian Open champion Azarenka is trying to become only the third woman to take Indian Wells and Miami in the same year after Graf in 1994 and 1996 and Kim Clijsters in 2005.
BEIJING under armour shoes on sale , May 10 (Xinhua) -- Vietnamese President Tran Dai Quang will pay a state visit to China from May 11 to 15 and attend the Belt and Road Forum for International Cooperation.
Quang was born on Oct. 12, 1956 in northern Vietnam's Ninh Binh province. Quang holds a doctorate degree and has been conferred the title of professor.
From October 1975 to September 1982, Quang served as an officer at the Ministry of Home Affairs (MoHA)' Political Protection Department One and MoHA's Political Protection Department Two.
He assumed vice head of professional office, under the MoHA's Political Protection Department Two curry 5 for sale , from September 1982 to June 1987. At the same time from 1981 to 1986, Quang was enrolled at Vietnam's People's Security Academy.
From June 1987 to June 1990, Quang acted as head of advisory office and head of professional office, under the MoHA's Political Protection Department Two. During the period from October 1989 to April 1991 curry 6 for sale , Quang learned high-level political theory in Nguyen Ai Quoc High-ranking Party Institute.