Sao Paulo, Brazil (SportsNetwork.com) - Joao Souza and lucky loser Luca Vanni earned upset victories on Friday in the quarterfinals of the Brasil Open.

Pablo Cuevas and Santiago Giraldo, the fifth and sixth-seeded players, respectively, also advanced to Saturday's semifinals at this clay court event.

Vanni, a 29-year-old Italian, earned his first career ATP World Tour semifinal berth when he beat Serbia's Dusan Lajovic, 7-6 (7-5), 7-6 (7-4).

Souza, a wild card and the only Brazilian remaining in the field, upended fourth-seeded Argentine Leonardo Mayer 6-4, 3-6, 6-3.

Also claiming a spot in the semifinals was Cuevas. The Uruguayan survived a challenge from the three-time champion of this event, Spain's Nicolas Almagro 7-6 (8-6), 3-6, 6-2.

Giraldo, from Colombia, defeated the third-seeded Italian Fabio Fognini 7-6 (7-4), 7-5.

On Saturday, Vanni will take on Souza, and Giraldo goes against Cuevas. This week's winner will collect $80,850.