The Australian Open record for the longest men's match was set in 2009, a five-setter between Rafael Nadal and Fernando Verdasco that Nadal won in 5 hours, 14 minutes.

BBC: Schiavone wins record women's tie against Kuznetsova

That 2008 Wimbledon twilight five-setter between Federer and Nadal set a glorious standard, but since then there's been a steady stream of classics, on all surfaces, between the big three, and even Murray, too.

WSJ: Jason Gay: Why Tennis Rules the Earth

Cilic will play seventh seed Andy Roddick in the quarterfinals after the American closed out victory over former runner-up Fernando Gonzalez of Chile in their five-setter, which ended in the early hours of the morning.

CNN: Cilic shocks fourth seed Del Potro in Melbourne