Harkleroad, ranked 67th in the world, stopped Loit 6-4, 6-1 in posting the day's lone upset, with none of the other seeded players even pushed to a third set.
Third-seeded Katarina Srebotnik was the most dominant, leading 6-0, 3-0 when Anastassia Rodionova retired with eye irritation. Fifth-seeded Anabel Medina Garrigues ousted Nicole Pratt 7-6 (7-3), 6-3 and No. 6-seeded Tamira Paszek defeated Yanina Wickmayer 7-6 (9-7), 6-1.
Additional wins Monday were posted by Yvonne Meusburger and Klara Zakopalova.
Swim Week Miami Beach 2014 [PHOTOS]