Andy Murray put his doubles disappointment behind him to move safely through to the third round of the singles with victory over Juan Monaco in Rio.

The world number two was very upset after he and brother Jamie lost their doubles opener on Sunday night.

The pair had set their sights firmly on a medal after their Davis Cup heroics together but were beaten by Brazilians Thomaz Bellucci and Andre Sa.

Around the same time, Murray's chances of a second successive singles gold improved significantly when Novak Djokovic was beaten by Juan Martin Del Potro in the singles.

Del Potro's Argentinian team-mate Monaco, ranked 107, appeared to hold few fears for Murray and so it proved as the world number two prevailed 6-3 6-1 after only 69 minutes.

Murray won the first three games, was pegged back to 3-2, but quickly forged ahead again, coming out on top of most of the long rallies and clinching the set with his fourth ace.

Monaco, who could well be an opponent for Murray in September's Davis Cup semi-final, had won two of his previous five matches against the Scot but both were more than five years ago.

The many Argentinians in the crowd were providing loud support to Monaco but his serve was taking a pounding and Murray quickly moved into a 4-0 lead in the second set.

The Scot, whose potential quarter-final opponent David Ferrer was knocked out by Evgeny Donskoy, kept his foot firmly on Monaco's throat and a missed backhand from the Argentinian sealed his fate.

Meanwhile, it was confirmed on Tuesday that Jamie Murray and Johanna Konta will be Britain's entry in the mixed doubles.

Andy also entered with Wimbledon champion Heather Watson but her ranking of 66 left them 18th in the entry list, which is decided on combined rankings, for the 16-team draw.

Rafael Nadal, who is still in singles and doubles, will challenge for a third medal alongside French Open champion Garbine Muguruza while Venus Williams' hopes of a fifth Olympic gold are still alive after she entered with Rajeev Ram.

Djokovic's Games are definitely over, though, and the world number one revealed after his doubles loss on Monday night that he will skip the Masters event in Cincinnati next week and will not play again until the US Open.

The draw paired Jamie and Konta with American duo Bethanie Mattek-Sands and Jack Sock in the opening round.

Andy said: "The plan was always that Jamie was going to play with Jo. Jamie is a way more experienced doubles player than me.

"Jo is playing well, too, so they have a good chance of winning a medal. There's an outside shot that me and Heather could potentially get in as well.

"But I've played a lot of tennis, it's been really hard to prepare for here after the French and Wimbledon. I hadn't played a match on a hard court for five months.

"Playing every day two matches in a row is not easy on this surface and in these conditions. So that made more sense."

The 29-year-old, who next meets either Italy's Fabio Fognini or Benoit Paire of France, was content with his performance against Monaco.

He said: "I played pretty well, hit the ball well from the back of the court, with not many unforced errors. It was a good match."