Murray storms into 3rd round; Keys enters quarterfinals

Rio de Janeiro - Murray is looking to make the most of the shock opening round exit of top seed Djokovic and become the first man to win two singles golds

Defending champion Andy Murray raced into the Olympic Games third round on Tuesday, blitzing close friend Juan Monaco of Argentina 6-3, 6-1.
World number two Murray is looking to make the most of the shock opening round exit of top seed Novak Djokovic and become the first man to win two singles golds.
The 29-year-old Wimbledon champion, who has not lost to Monaco in six years, will face France's Benoit Paire, the 16th seed, or Fabio Fognini of Italy for a quarterfinal spot.
Murray was hardly troubled by Monaco on centre court.
The Argentine never fully recovered from a fall in the second game of the opening set where he aggravated a long-standing hip injury.
Murray reeled off five games against the world number 108 and was soon 4-0 up in the second set before going on to claim victory in just 69 minutes.
American seventh seed Madison Keys hailed Serena Williams for inspiring her to reach the quarterfinals.
Keys, 21, was the first woman into the last-eight thanks to a 6-3, 3-6, 6-3 win over gritty Spaniard, Carla Suarez Navarro.
But she gave credit to 22-time Slam winner Williams, the top seed in Rio and defending Olympic champion.
"Hey, I'm happy to be on the same team as Serena Williams, it's thanks to her that I was able to get my ranking up and qualify," said Keys.
Keys, who made the Australian Open semi-finals in January, will face either Italy's Sara Errani or promising Daria Kasatkina of Russia for a place in the last four.
Defending champion Serena Williams ended a three-match losing streak against France's Alize Cornet to keep her hopes of a fifth Olympic gold medal alive Monday.
But it was a rollercoaster 7-6 (7/5), 6-2 victory for the 34-year-old world number one who 24 hours earlier had suffered her first ever Olympic Games women's doubles loss with sister Venus.
Juan Martin del Potro followed up his shock defeat of Novak Djokovic by downing Portugal's Joao Sousa in front of a legion of passionate, vocal Argentine fans.
The giant 27-year-old, ranked 141 in the world after years of wrist injury misery pushed him to the brink of quitting, swept to a 6-3, 1-6, 6-3 win.
Dressed in sky blue football shirts, the Argentine's followers draped national flags and banners over the centre court barriers and responded defiantly when locals booed the mention of del Potro's name.
However, traditional bitterness between Brazil and Argentina boiled over when a group of fans engaged in a punch-up.
"I hope that will not happen again because we need to have peace between Argentina and Brazil. This is not football," said del Potro.
The 2009 US Open champion said he was running on empty by the end after only getting to bed at 4:30 in the morning. "I only had five hours' sleep but I'm very glad with my success," he said.
Things got even better for Del Potro when French fifth seed Jo-Wilfried Tsonga, a potential quarterfinal opponent, lost 6-4, 6-3 to Gilles Muller of Luxemburg.
Japan's fourth seed Kei Nishikori wrapped up the day with a 7-6 (7/4), 6-4 win over Australia's John Millman. 
Nishikori was 2-5 and 2-4 down in both sets.
Del Potro eventually ran out of steam when he and Maximo Gonzalez lost their men's doubles second round tie to Rafael Nadal and Marc Lopez.
The 6-3, 5-7, 6-2 scoreline gave the Spanish pair a quarterfinal spot, adding to the workload for Nadal who is still in singles and intends to play mixed doubles.
Nadal, in his first tournament since a wrist injury forced him out the French Open two months ago, said he still intends to enter the mixed with Garbine Muguruza despite having now played three matches in two days in Rio.
"I feel good, there was a lot of tension and emotion as I haven't played in a competition for so long," said Nadal.
Djokovic suffered a second Olympic defeat in the space of 24 hours when he and Nenad Zimonjic were knocked out of the men's doubles.
The Serb pair lost 6-4, 6-4 to Brazilian fourth seeds Marcelo Melo and Bruno Soares.
German second seed and Australian Open champion Angelique Kerber recovered from a 4-1 first set deficit to defeat Canada's Eugenie Bouchard, 6-4, 6-2.
It was Kerber's first win over the 2014 Wimbledon runner-up in three years.
Kerber next faces Australia's Samantha Stosur who was too strong for Misaki Doi of Japan, winning 6-3, 6-4.
Muguruza, the French Open champion, routed Japan's Nao Hibino 6-1, 6-1 in just 55 minutes.
Up next for the third seed is Monica Puig of Puerto Rico.