US Open: A look at 5 big upsets in the last decade

#1 2009 Final: Del Potro beats Federer 3-6, 7-6(5), 4-6, 7-4(4), 6-2

Del Potro beats Federer in the 2009 US Open final

In his sixth US Open final in as many years, five-time defending champion Roger Federer was an overwhelming favourite against young Argentinian Juan Martin Del Potro.

Federer lived up to his top billing by romping to the first set for the loss of just three games. Del Potro looked overawed by the occasion as Federer seemingly took control of the match, as he served for the second set and arrived at 30-0.

However, a contentious video referral at 30-30 perturbed the serene Swiss who lost four consecutive points to drop serve. Del Potro capitalised on Federer's lapse to take the second set and level the match at a set apiece.

The Argentinian broke Federer in the third set and led 4-3, only for the defending champion to respond by reeling three games on the trot to take a two-sets-to-one lead.

With the momentum now firmly in his favour, the Swiss looked to be cruising to his sixth title at 5-4, 30-30 on Del Potro's serve only for the Argentinian to dash the Swiss maestro's hopes by forcing a decider.

Federer couldn't withstand the barrage of heavy forehand artillery from the Argentinian in the final set as Del Potro ended the five-time champion's reign to celebrate a maiden Slam title. It also enabled him to become the youngest US Open champion since Lleyton Hewitt's win in 2001.