Pros who have switched from 1 to 2 handed backhand (or vice versa)

[uncertainterms]

I was watching ATP tour uncovered the other day and there was a feature on Jurgen Melzer. During his montage, there was a shot of him hitting a one handed topspin backhand during matchplay on a clay court (everyone here probably knows, Melzer now hits a two handed backhand).
I know Djokovic switched from one handed backhand to two because, according to him, opponents would pepper his one handed topspin shot and he thought it was his weakness. I would say it has served him well.
Does anyone know of any other pro players who have switched from one handed to two handed backhand (or vice versa) and what their reasons have been.

 

[BTURNER]

i know a few who have two handed flat on topspin, and developed on one handed slice to compliment, and approach with. Wilander for one.

 

[so_cute_and_fluffy]

In Sampras' autobiography he says that he switched from a two-handed to single-handed backhand when he was a junior