Croatian Marin Cilic has emerged with a "miracle" to win the US Open following months held under a doping ban.

Boris Becker, Goran Ivanisevic, Stefan Edberg and Michael Chang are the celebrity coaches behind the men’s US Open semifinalists.

Andy Murray proved too strong for Japanese star Kei Nishikori, reaching the semifinals of the Australian Open after a comfortable straight-sets win.

World number one Rafael Nadal of Spain rolled into the fourth round of the US Open while Japanese teen Kei Nishikori pulled off the biggest upset.