BUENOS AIRES, Argentina — Fifth-seeded Dominic Thiem of Austria reached his second quarterfinals of the young season when he defeated qualifier Gastao Elias of Portugal 3-6, 7-6 (7), 6-3 in the Argentina Open on Wednesday.
Thiem, the youngest player in the top 20 at age 22, prevented Elias from making his first career ATP quarters.
In another second-round match in the clay-court tournament, 2011 champion Nicolas Almagro of Spain beat Federico Delbonis 6-3, 4-6, 6-4, his third win over the local hope after 2012 and '13.
Top-seeded Rafael Nadal, the defending champion, faces Juan Monaco of Argentina on Thursday in the second round.