This should be the first real test of the tournament for Djokovic. Del Potro appears to be back to almost 100% after injuries in 2010 and a scare about a month ago.
Djokovic has been playing almost flawless tennis and he may have to do that again to be the Argentine, Del Potro.
They haven't played since 2009, and Novak leads the career series 3-0. I expect him to make that 4-0 on Friday. If Del Potro serves and returns big, he has a chance.
I like Djokovic to remain undefeated on the season and win in 4 sets.