Serena Williams and sister Venus both through to quarter-finals in Miami.
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.
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.
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.
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.