Juan Martin del Potro put Argentina into its third straight Davis Cup semifinal with a three-set victory over Croatia's Marin Cilic on Sunday.

Del Potro won 6-1, 6-2, 6-1, to give Argentina an insurmountable 3-1 lead in the best-of-five quarterfinal. Juan Monaco defeated Antonio Veic 6-1, 6-1 to wrap up the 4-1 victory.

Argentina will face the Czech Republic in Buenos Aires in the semifinal on Sept. 14-16. Argentina lost last year's final against Spain and has been in the Davis Cup finals four times without winning.

SI Apps
We've Got Apps Too
Get expert analysis, unrivaled access, and the award-winning storytelling only SI can provide - from Peter King, Tom Verducci, Lee Jenkins, Seth Davis, and more - delivered straight to you, along with up-to-the-minute news and live scores.