2013 BNP Paribas Open men's quarterfinals: Who's your picks?

1) Djokovic vs. Tsonga

2) Murray vs. Del Potro

3) Berdych vs. Anderson

4) Nadal vs. Federer

My picks are: 1) Djokovic, 2) Murray, 3) Berdych, 4) Federer. What's yours?