Baseball Autographed by DJ LeMahieu. David John LeMahieu is a second baseman for the New York Yankees. He previously played for the Chicago Cubs and Colorado Rockies. Colorado Rockies Magazine (August 2018 edition) autographed by Charles Cobb Blackmon, nicknamed "Chuck Nazty", is acenter fielder for the Colorado Rockies. He made his MLB debut on June 7, 2011, as a member of the Rockies.