US Open Tennis Watch Online Sopcast

A semi-final against Rafael Nadal, who is leading a rain-suspended quarter-final with Fernando Gonzalez, should hold little fear for him, not after the way del Potro dismantled the Spaniard in Miami earlier this year and again in Montreal last month.

And while Cilic is ranked 16th, the giant Croatian had already torn apart world No. 2 Andy Murray before del Potro ground down his mind, body and game.

Only one Slam since Marat Safin's 2005 Australian Open title has gone to a player other than Roger Federer or Nadal. Novak Djokovic won down under in 2008.

Del Potro has a great opportunity, but his path couldn't be tougher. He caught a break by avoiding Murray in the quarter-finals thanks to Cilic, but he will still most likely have to defeat two eternal greats in Nadal and Federer to claim his