Top seed Serena Williams advanced to the quarter-finals of the Miami Open on Monday as Venus Williams upset Caroline Wozniacki . Serena Williams beat 24th seed Svetlana Kuznetsova 6-2 6-3 , while her elder sister Venus , who is the 16th seed , beat fourth seed Wozniacki of Denmark 6-3 7-6 ( 7/1 ) . Venus Williams will play Carla Suarez Navarro , the 12th seed , in the last eight after the Spaniard beat seventh seed Agnieszka Radwanska of Poland 5-7 6-0 6-4 . Venus Williams celebrates after defeating Caroline Wozniacki to reach the Miami Open quarter-finals . Venus defeated the Dane , who was seeded fourth in the tournament , 6-3 7-6 ( 7/1 ) Williams reaches to make a return during her victory over Wozniacki at Key Biscayne . Wozniacki was the fourth seed in the Miami Open but crashed out at the last 16 stage . Serena Williams will next play Sabine Lisicki of Germany after her 6-1 6-2 defeat of Sara Errani of Italy . Third seed Simona Halep of Romania and 15th seed Flavia Pennetta of Italy were in action late on Monday night . The winner of their match will next play Sloane Stephens after the American reached the fifth round for the first time in her career by dispatching Switzerland 's Belinda Bencic 6-4 7-6 ( 7/5 ) in a gruelling encounter . Ninth seed Andrea Petkovic of Germany beat eighth seed Ekaterina Makarova of Russia 6-1 7-5 and will play Czech Republic 's Karolina Pliskova next after her 6-3 6-2 defeat of Daria Gavrilova of Russia . Serena Williams celebrates after winning a game in her 6-2 6-3 victory over Svetlana Kuznetsova . Serena will face Germany 's Sabine Lisicki in the quarter-finals after making it through on Monday . In the men 's draw , world number one Novak Djokovic resisted a brave rally from qualifier Steve Darcis to reach the fourth round . The Serbian , victorious at Indian Wells earlier this month , swept Belgium 's Darcis aside in the first set but was given a sterner examination in the second before closing out a 6-0 7-5 win . Djokovic will next play Ukraine 's Alexandr Dolgopolov , who defeated Brazil 's Thomaz Bellucci 7-5 6-4 . Fourth seed Kei Nishikori of Japan beat Viktor Troicki of Serbia , the 32nd seed , 6-2 6-2 and will next play 18th seed David Goffin of Belgium , after his 6-4 6-3 defeat of Poland 's Jerzy Janowicz . World No 1 Novak Djokovic in action against Steve Darcis at the Miami Open . Fifth seed Milos Raonic of Canada claimed a 6-1 5-7 7-6 ( 7/3 ) win over France 's Jeremy Chardy , the 31st seed . Raonic will next play John Isner after the big-serving American got the better of ninth seed Grigor Dimitrov to win 7-6 ( 7/2 ) 6-2 . Sixth seed David Ferrer comes up against Gilles Simon in the next round after ousting Lukas Rosol 6-4 7-5 . Simon , France 's 12th seed progressed by beating Alejandro Falla 6-3 6-4 .
Venus defeated Wozniacki 6 - 3 7 - 6 ( 7/1 ) to reach the quarter - finals . Serena beat 24th seed Svetlana Kuznetsova 6 - 2 6 - 4 . Carla Suarez Navarro and mark peers also made it through . Novak ##erer defeated Steve ##erer 6 - 0 7 - 5 to reach the fourth round .