One problem: He couldn't find his helmet. Eager to move the lopsided game along -- Washington led at the time, 8-1 -- home-plate umpire Vic Carapazza approached the Brewers' dugout and expressed urgency. With the helmet still missing in action, Roenicke instead sent backup catcher Martin Maldonado to bat.
Maldonado hit the second pitch he saw for a single, and Ryan Braun followed with a two-run home run.
Gennett's leg is not considered a serious matter.
"We don't think so," Roenicke said. "He played. We knew it was tight, and the second or third inning, we watched him and I thought if there was a time in the game and I could get him out of there, I would get him out of there."
Adam McCalvy is a reporter for MLB.com. Read his blog, Brew Beat, and follow him on Twitter at @AdamMcCalvy. This story was not subject to the approval of Major League Baseball or its clubs.