cilic is the 2014 u.s. open champion but is struggling for fitness and form after a shoulder injury that estrella 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 .