The former Arizona Diamondbacks star opened up to the media in his first Chase Field appearance since leaving in free agency.

Christian Walker looks on after striking out in the fourth inning on Monday. (Sarah Stier / Getty Images) Walker has become one of the most important players on this surging Diamondbacks team.

Christian Walker singles to right field in the top of the 5th inning for his 800th career hit and makes it a two-run deficit ...