King of Clay was "very emotional" watching Tiger Woods' Masters triumph.
Dethroning king of clay is world No. 1's toughest test.
Houston champion is king of the hill.
Former No. 1 traveled to Miami to talk hip health with Bob Bryan.
Three-time Grand Slam champion talks rivalries and tennis heroes.
World No. 42 adds former major finalist to coaching team.
Clay season just got brighter.