I just saw Del Potro defeat Nadal in the U.S. Open semis. Del Potro played amazingly, but it was disappointing to see Nadal so easily defeated. I don't think Nadal has been at his best since having had to take time off due to injuries. Del Potro made it look easy which was unbelievable. Del Potro is playing unbelievably - serving great and absolutely lethal off both wings. The final is going to be a really intense match up. Stay tuned!