Czech joins Canadian Felix Auger-Aliassime as wild-card recipient.
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.
