Who will break Federer's GS Semifinals Streak?

World #1 Roger Federer's quarterfinal victory over Nikolay Davydenko in the 2010 Australian Open men's singles tournament means that his streak of reaching consecutive Grand Slam semifinals is intact. With the win, he has now reached 23 straight grand slam semifinals. It's probably one of the most impressive records in his resume - below his number of Grand Slam wins, and above his number of weeks at the #1 spot.

The interesting question would be: who will break Roger Federer's streak of consecutive grand slam semifinals appearances? Here's the top scenarios that come to mind:

#5. John Isner will beat Federer in three tiebreak sets at the 2010 US Open

#4. Marin Cilic will play perfect tennis and oust Federer in the fourth round or quaters of the 2010 US Open

#3. Andy Roddick will serve 80 aces to oust Federer at 2010 Wimbledon

#2. Federer will be injured and will skip a Grand Slam this year

#1. Nadal will fall below the top four and as the fifth seed, will be drawn to play Federer in the 2010 French Open quarterfinals