Sweeting battled Gilles Muller for more than 2 hours before claiming a 3-6, 7-6 (7-2), 7-5 win. He didn't face a break point after the first set. Sweeting was called into the main draw when sixth-seeded Florian Mayer withdrew with a hip injury.
Australian Matthew Ebden posted an upset of seventh-seeded Marcel Granollers with a 6-1, 3-6, 6-3 win. Ebden fought off 9-of-10 break points he faced, including all four of those situations in the third set.
Denis Istomin topped Pablo Andujar 6-3, 2-6, 6-3 in the other match Monday to go three sets. Istomin won 69 percent of the points on serve.
Swim Week Miami Beach 2014 [PHOTOS]