PARIS (AFP) - Andy Murray's heroics for Britain in tennis' Davis Cup at the weekend have seen him rise back up to fourth in the ATP world rankings.

He defeated both Donald Young and John Isner as he spearheaded his side to a win over the United States in Glasgow in a World Group first-round tie.

That helped the Scot move back ahead of Kei Nishikori, who won both of his singles for Japan against Canada but still finished up on the losing side.

Novak Djokovic, who won both singles and doubles for Serbia in a 5-0 whitewash of Croatia, remained comfortably top of the rankings, 4,000 points clear of second-placed Roger Federer, with Rafael Nadal in third.

Canadian Milos Raonic is ranked sixth, followed by Stan Wawrinka of Switzerland, David Ferrer of Spain, Tomas Berdych of the Czech Republic and Marin Cilic of Croatia.