Originally Posted by spperry
Here is link to a video about Oscar Borras who helped Nadal develop his serve in the post season in 2010.
Oscar Borras and that video have been thoroughly discredited. He never coached Rafa or developed his serve - he showed up at Rafa's practice one day with some crazy claims and a videographer. Rafa and Toni humoured him and a 40 minute video has been edited down to 10 minutes. It doesn't show Rafa and Toni laughing at him and gawking at him in disbelief.
The same guy also claimed to have taught JC Ferraro how to serve ten years earlier and caused JC so many problems he took him to court.
As to whether Rafa should change coaches - no. Why tamper with an obviously good thing?