Kansas City Royals center fielder Billy Hamilton (6) fails to catch a fly ball hit by Seattle Mariners’ Mitch Haniger during the ninth inning of a baseball game at Kauffman Stadium in Kansas City, Mo., Thursday, April 11, 2019. Hamilton was injured on the play. The Mariners defeated the Royals 7-6 in 10 innings. (AP Photo/Orlin Wagner) Orlin Wagner The Associated Press
Billy Hamilton spent Friday afternoon with a trainer as his chaperone. He shagged fly balls, took some swings in a batting cage and tried running some sprints — all to test a knee injury that he said was still causing him a bit of pain.