"He's just such an outlier," Yankees setup man Andrew Miller said of his teammate.
The only other time Chapman has thrown 105 came during the 2010 season while he was a member of the Cincinnati Reds. That pitch, delivered to Tony Gwynn Jr. of the San Diego Padres, was officially clocked at 105.1 mph and stands as the fastest officially recognized pitch thrown in baseball history.
Chapman's last pitch Monday night was 104.7 to O's first baseman Ryan Flaherty and led to a game-ending grounder. That pitch is the third fastest Chapman has thrown in his career, according to ESPN Stats & Information.
Despite lighting up the gun, Chapman failed to record a strikeout during his ninth-inning appearance. All was not lost, however, as he did collect his 19th save of the season to close out a 2-1 win for New York.
Information from The Associated Press was used in this report.