`` I did n't have any expectations coming into this tournament because I 've never played that well in Miami , '' the Romanian 28th seed said . World No . 1 Novak Djokovic stays on course for third successive Miami title . Serbian will next face 15th seed Tommy Haas in the last 16 of hard-court event . Maria Sharapova , four times a runner-up at Key Biscayne , also through to round four . Indian Wells winner will next play Czech world No . 22 Tomas Berdych.
World No . 1 Novak Djokovic stays on course for third successive Miami title . Serbian will next face 15th seed Tommy Haas in the last 16 of hard-court event . Maria Sharapova , four times a runner-up at Key Biscayne , also through to round four . Indian Wells winner will next play Czech world No . 22 Tomas Berdych.