Originally Posted by HunterST
I see your point, but don't we have pretty strong evidence that Nadal made the changes that Borras suggested? So it's not like the guy made some recommendations that Nadal ignored and then never talked to him again. The adjustments Borras suggested were a big part of Nadal's improved serving. It seems only right to give the guy credit.
For some reason, it seems like Nadal, and probably most other players, never want to admit that they've made any change to their technique.
The video was recorded at the end of 2009 if I remember correctly. Nadal's serve didn't improve/implement changes until US Open 2010 which is almost a year later.