I have to be slightly worried when I read this sort of stuff.
Nole has tried to change his serve recently and it's been a complete disaster.
Murrays first serve when it's in is a exceptional weapon but he dips under 50% in most of his matches of late. As people have said Murrays 2nd serve is the worst of the big boys by miles. How would trying to learn a new action for 1st serves and then reverting back to your own 2nd serve style work? I have no idea.
Rafa is back. Unless he's thinking he can't play long term unless he starts to shorten points I'm mystified has to why he would change his serving action.
no rafa needs to get a bigger serve that gets aces or service winners.
especially in faster courts he needs it.
he doesnt go for the corners, its always a few inches away from the corners which gives his opponents the time to return it.
his fastest serve is around 200km/h, he needs to get that up tp 210km/h and be more accurate with it by going for the corners bit more often rather than middle of the box.
he needs to increase his average 1st serve speed aswell as his average 2nd serve speed.
his serve is the worst out of the top 10.
he has to work so hard on his service games, now how is he going to do that when he becomes a bit older and his running speed slows down.