( CNN ) -- Novak Djokovic and Maria Sharapova progressed to the fourth round of the Miami Masters on Sunday , neither impressed with their form as they battled windy , hot conditions . Djokovic , seeking to emulate Andre Agassi -- the only man to win at Key Biscayne three years in a row , from 2001-03 -- beat 254th-ranked Indian Somdev Devvarman 6-2 6-4 . `` It was very difficult to kind of get into a rhythm because you could n't really serve at 100 % and you had to go more for precision and put twice as much effort into the step adjustments because of the windy conditions , '' said the world No . 1 , who will next face veteran German Tommy Haas in the 10-day hard-court event . `` All in all , I 'm just happy to get through the rough day . '' Djokovic , seeking his fourth Miami crown , having also won in 2007 as well as losing the 2009 final , was joined in the last 16 by Spanish third seed David Ferrer , who will next play Japan 's No . 13 Kei Nishikori . The Australian Open champion 's fellow Serbian Janko Tipsarevic , the seventh seed , will next face French No . 11 Gilles Simon . Sharapova has been in four title matches in Miami , including the last two , and come away emptyhanded every time . She is seeking to become only the third woman to win the Indian Wells/Miami double in the same season , and kept alive her hopes with a 6-4 6-2 win over fellow Russian Elena Vesnina , the 29th seed . `` It was n't easy for the both of us with the heat and the wind , '' said the world No . 2 , who is seeded third . `` It was just one of those days where you know you might not be playing your best tennis -- I certainly was n't today . `` But I got through , and I 'm onto the next one . '' Sharapova will next face 21st-seeded Czech Klara Zakopalova , who upset another Russian when she beat No . 14 Maria Kirilenko 6-2 7-6 ( 7-4 ) . Sharapova lost to the 31-year-old when she was just 15 , back in 2003 at the Australian Open , but has won their last four meetings including a last-16 match in Qatar this year . Romania 's Sorana Cirstea earned a clash with former world No . 1 Jelena Jankovic after eliminating German sixth seed Angelique Kerber 6-4 6-0 . `` 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 . `` But I 've been fighting the best I could and working my way through every single match , and it 's working . '' Jankovic , the 2008 runner-up , beat Russian 11th seed Nadia Petrova 7-6 ( 9-7 ) 6-4 . Alize Cornet ended the hopes of 19-year-old American Lauren Davis , who was allowed into the main draw when second seed Victoria Azarenka pulled out due to ongoing ankle problems . The French 32nd seed came from behind to win 2-6 6-3 6-2 and earn a clash with either Italian Roberta Vinci or Spain 's Carla Suarez Navarro .
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.