Del Potro Says His Backhand Is Still Improving Miami 2018 Mar 25, 2018 Juan Martin del Potro reacts to his third-round victory at the Miami Open presented by Itau against Kei Nishikori. Watch live tennis at tennistv.com. Tags: Interviews Juan Martin del Potro Miami Share 0 Share on Facebook Tweet Tweet on Twitter +1 +1 on Google Plus