Sao Paulo, Brazil (SportsNetwork.com) - Third-seeded Fabio Fognini and No. 6 seed Santiago Giraldo were a pair of second-round winners Thursday at the Brasil Open.

The fiery Italian Fognini snuck past Argentine Diego Schwartzman 6-3, 1-6, 6-2, while the Colombian Giraldo overcame fellow South American Carlos Berlocq of Argentina 4-6, 7-5, 6-3 at this clay court event.

Two seeded players -- No. 7 Fernando Verdasco and No. 8 Martin Klizan -- both lost in three sets. Dusan Lajovic outlasted Verdasco, 6-7 (6-8), 6-3, 6-4, while qualifier Joao Souza downed Klizan, 3-6, 6-3, 6-2.

Meanwhile, 19-year-old upstart Italian lucky loser Luca Vanni outlasted Dutch qualifier Thiemo de Bakker 7-6 (7-5), 3-6, 6-3 to reach his first-ever ATP- level quarterfinal.

This week's winner will collect $80,850.