Bastad - Argentine qualifier Renzo Olivo, ranked 282, has ousted second seed Tommy Robredo of Spain 7-6 (6), 6-3 to reach the Swedish Open quarterfinals on Wednesday.
Olivo had never won in an ATP main draw until he beat Paul-Henri Mathieu in the first round.
The Bastad champion in 2006 and 2008, Robredo was coming off a fourth-round showing at Wimbledon.
Fifth-seeded Joao Sousa reached his second quarterfinals in three tournaments after beating local wild card Elias Ymer 6-3, 7-5. The Portuguese faces Dusan Lajovic after the Serb advanced when fourth-seeded Jerzy Janowicz of Poland retired with a foot injury while Lajovic led 6-3, 1-1.
Pablo Cuevas of Uruguay beat wild card Christian Lindell of Sweden 4-6, 6-2, 7-6 (2) to advance to his first quarterfinals in more than three years.
Results from the ATP Swedish Open on Wednesday (x denotes seeding):
Dusan Lajovic (SRB) bt Jerzy Janowicz (POL x4) 6-3, 1-1 retired
Joao Sousa (POR) bt Elias Ymer (SWE) 6-3, 7-5
Pablo Cuevas (URU) bt Christian Lindell (SWE) 4-6, 6-2, 7-6 (7/2)
Renzo Olivo (ARG) bt Tommy Robredo (ESP x2) 7-6 (8/6), 6-3