[paulxx23]

More that can be used as a tactic rather than reply or response.

 

[Federer-Fan]

A lot of top players need more variety, but I'd say Berdych is a better example than Ferrer or Raonic because he's more talented.

 

[MWW]

Nishikori - speaking as a fan, he could use the BH drop shot more (a bit like Novak does)...never really seen him do it, he does FH dropshots but not much BH...and input some slices to change up time to time (as much as I do love his topspin BH, could change up a bit)
Berdych for sure.

 

[Floki]

Murray, Nadal, Berdych, Nishikori, Ferrer, Raonic, ...

Pretty much everyone except Djokovic and Federer.