U.S. Open champion Marin Cilic was eliminated in the second round of the Barcelona Open on Wednesday, losing to Victor Estrella of the Dominican Republic 6-4, 6-4. Also, Santiago Giraldo of Colombia beat Joao Sousa of Portugal 6-3, 3-6, 6-1, to reach a third-round meeting against top-seeded Kei Nishikori, setting up a rematch of last year's final won by the Japanese. Estrella broke Cilic four times on the outdoor red clay, stealing his serve to go ahead 5-4 in the second set, and finishing off the ninth-ranked Croat by holding serve to love. Victor Estrella of the Dominican Republic recorded a 6-4 6-4 victory over Main Cilic at the Barcelona Open . Cilic is the 2014 U.S. Open champion but is struggling for fitness and form after a shoulder injury . Estrella, who had won only one match in his last five tournaments, celebrated after placing a long forehand out of Cilic's reach on match point. It was only Cilic's third tournament of the season after he rested to recover from a shoulder injury. As the fourth seed, he had a bye in the first round. 'I was not too happy with the way I played,' Cilic said. 'I made a lot of unforced errors. I feel I still need several matches to get my form to a good stage.' Estrella, ranked 53rd, last year became the first Dominican to finish a season in the top 100. On court No. 1, Pablo Andujar of Spain roared back to oust 11th-seeded Leonardo Mayer of Argentina 2-6, 6-1, 6-2.
Marin Cilic defeated 6-4 6-4 by Victor Estrella in the Barcelona Open .
The U.S. Open champion is struggling for form after a shoulder injury .
Cilic said he needs more matches to get his game up to scratch .