19:53 CET - Solana Sierra is the first winner of the day in Sao Paulo, with the Argentine battling through a tight opening set to defeat Arianne Hartono 7-6(4), 6-3.
Meanwhile, Victoria Rodriguez has also progressed after her opponent, Ajla Tomljanovic, was forced to retire while trailing 4-6, 2-4.
16:00 CET - Good afternoon and welcome to our coverage of today's tennis in Guadalajara and Sao Paulo!
Play gets underway in just over two hours, with Ajla Tomljanovic taking on Victoria Rodriguez in the opening round in Sao Paulo.
Later on, seventh seed Leolia Jeanjean begins her campaign in Brazil against Janice Tjen, while over in Guadalajara, Alycia Parks and Iva Jovic are among the standout names in action.
Check out the full schedules in Guadalajara and Sao Paulo via the links.