Querrey won 52 percent of his return points and ousted Falla in 58 minutes.
Kei Nishikori, the No. 5 seed, also moved on with 6-4, 7-5 win over qualifier Illya Marchenko, and Igor Sijsling topped defending champion Jurgen Melzer 6-4, 7-6 (3).
Jordana Brewster on Paul Walker: 'He was an enormous presence in my life'
Benedict Cumberbatch's dramatic reading of R. Kelly lyrics is just what you need