Some guys have the clutch gene, and others don't. That's pretty much what this match comes down to. Tsonga's backhand may be poor, his technique may not be fundamentally sound, but when the going gets tough, he can rocket out those serves and huge forehands. Tsonga is in the QF and hasn't played a good match yet, so you can't argue with the results.
One of the worst serves ever at *1-5 15-30 in the second set from Verdasco. Hopefully someone turns that into a gif.
Here it is:
So he shanks the first serve past the baseline, then underarms a ball into the sky and is still allowed a second serve? OK.