Rohan Bopanna and his Pakistani partner Aisam-ul-Haq Qureshi warded off stiff challenge from the Slovak-Belarussian pair of Michael Martinek and Dick Norman to enter the quarterfinals of the Miami WTA and ATP Masters.
The seventh-seeded pair defeated their unseeded opponents in an energy-sapping match 7-6(4), 3-6, 10-8. They will now face top seeded American pair of Bob and Mike Bryan.
Djokovic's dream run
Novak Djokovic ran his phenomenal 2011 win streak to 20-0 Sunday, with a 6-2, 6-0 thrashing of former top 10 player James Blake at the $9 million (R40.29 crore) Miami WTA and ATP Masters.
The second-seeded Serb, winner of all three events he has played this season, remains the only man in the top 125 not to have lost a match this year.
Fresh from beating Roger Federer and Rafael Nadal en route to victory in last week's Indian Wells Masters, Djokivic is bidding to add a second Miami trophy to the one he won in 2007.
Djokovic raced to victory in 52 minutes to reach the fourth round of the tournament. "It has been a dream run for me the last couple of months," said Djokovic, who opened his year with an Australian Open win.
Former US Open champion Juan Martin del Potro also advanced Sunday, storming further down his comeback path with a 6-3, 6-2 victory over fourth-seeded Swede Robin Soderling who has won 20 matches and three titles in 2011.
But now Del Potro has pulled alongside him as he produced his own 20th win of the year.
Second seed Kim Clijsters, winner of the last two Grand Slams, got past tricky Spanish left-hander Maria Jose Martinez Sanchez 6-4, 4-6, 6-3.