Nadal can serve big out wide on the duece side, but he never really does that on the ad side imo, not even at the past USO. On the ad side he is more or less a 105 mph guy with great location. He was doing that really well today. Check his 1st serve mph at the USO and you will notice his avg. mph out wide on the ad side was considerably lower than his avg mph out wide on the duece side.
Sure dude. Obviously it's harder for a lefty to serve hard out wide on ad court compared to the deuce court. One curls outward and the other inward.
On the ad-side Nadal can use the lefty spin and get a vicious angle so that his serve becomes virtually unplayable if it hits the correct spot on the short-right corner of the service line.
On a deuce-side he goes for much less spin; a flatter serve - which is easier to do coz he's a lefty.
Now coming to Nadal's serve, overall, I agree that it's slower in Miami but, perhaps, more effective than it was in IW. He now needs to work on increasing the pace without sacrificing the accuracy. Good returns like Djokovic, Fed, Murray, Delpo etc won't be bothered by 110-120 mph serves.
All said and done, I think UsO was a career best serving performance by Nadal. He had tremendous pace and accuracy. It was like having his cake and eating it too. I dunno how he managed to serve so well in those 2 weeks.
It remains to be seen whether he can EVER get back to "that" level of serving..