BALTIMORE -- Shortly before breaking the Reds' club record for steals by a rookie on Tuesday, center fielder Billy Hamilton was involved in a collision with an umpire that left both shaken up.
Hamilton led off the game vs. the Orioles with a comebacker that kicked off pitcher Bud Norris, who recovered to make a desperation toss to first base. Hamilton legged out a single on the play before colliding with umpire Mike DiMuro, who was stationed down the line.
Both Hamilton and DiMuro went down, with Hamilton staying down for a few moments. While he was looked over by Reds trainer Paul Lessard and manager Bryan Price, DiMuro was checked out by Orioles assistant trainer Brian Ebel.
Hamilton was able to remain in the game, but DiMuro was walked off the field by Ebel.
"[Umpire] Jerry Layne was telling me he had some neck surgery before," Orioles manager Buck Showalter said. "I know he felt like a concussion. Makes you wonder why it doesn't happen more [when] guys are trying to get into position to see the play."
A few moments later with Todd Frazier batting, Hamilton stole second base. It was his 55th stolen base of the season, establishing a new club record for rookies. After a swipe on Sunday at Pittsburgh, Hamilton briefly co-owned the mark with Bob Bescher.
Set in 1909, Bescher's record held for 105 years.
"I got a little blurry. Other than that, nothing else hurt on my body. I hope he's OK," Hamilton said of DiMuro. "It was just a little blurry, not much at all. It was something that was going to be there for a second. I got over it."
Mark Sheldon is a reporter for MLB.com. Read his blog, Mark My Word, and follow him on Twitter @m_sheldon. This story was not subject to the approval of Major League Baseball or its clubs.