Former champion Marin Cilic opened his U.S. Open campaign with a solid 6 - 4 7 - 5 6 - 1 victory over Rogerio Dutra Silva of Brazil .
Former champion Marin Cilic is a popular pick to make a deep run in the year 's final grand slam .
Former champion Marin Cilic , a popular pick to make a deep run in the year 's final grand slam , opened his U.S. Open campaign with a solid 6 - 4 7 - 5 6 - 1 victory over Rogerio Dutra Silva of Brazil .