Sharapova, the No. 3 seed, opened her 2014 season with a 6-3 6-0 rout of Carolina Garcia, dropping just nine points on serve and not facing a break point. Sharapova lost eight points overall -- two on serve -- in the second-set shutout.
Sharapova had played just three matches -- and not at all since August -- after losing in the finals of the 2013 French Open because of a shoulder injury.
Also Monday, Ashleigh Barty defeated Daniela Hantuchova 6-3, 7-5; Kaia Kanepi edged Alexandra Panova 6-3, 6-7 (8-10), 6-2; Anastasia Pavlyuchenkova outlasted Alla Kudryavtseva 7-6 (7-4), 4-6, 6-3; and Casey Dellacqua rallied to beat Galina Voskoboeva 3-6, 6-2, 6-3.