Carlos Berlocq, Grigor Dimitrov advance in Bastad
Berlocq broke Zeballos' serve three times.
Earlier Monday, Bulgaria's Grigor Dimitrov rallied to beat 17-year-old Elias Ymer of Sweden 5-7, 6-2, 6-4.
Argentina's Martin Alund defeated Sweden's Markus Erikson 7-5, 6-7 (5), 7-6 (8) to advance to the second round of the clay-court tournament.
Copyright 2013 by The Associated Press
This story is from ESPN.com's automated news wire. Wire index
MORE TENNIS HEADLINES
- Top seeds Cirstea, Svitolina win Baku openers
- Kirilenko ends engagement to Caps' Ovechkin
- Querrey wins Atlanta opener; Young ousted
- Wozniacki routs Vinci in Istanbul Cup final