Pittsburgh Pirates starting pitcher A.J. Burnett (34) throws in the first inning against the Cincinnati Reds at PNC Park in Pittsburgh, on June 25, 2015. Photo by Archie Carpenter/UPI Stock Photo - Alamy

19 June 2015: Pittsburgh Pirates shortstop Jordy Mercer (10) warms up at Nationals Park in Washington, D.C. where the Washington Nationals defeated the Pittsburgh Pirates, 4-1. (Icon Sportswire via AP Images Stock Photo - Alamy

September 16 2015: Pittsburgh Pirates starting pitcher A.J. Burnett (34) sits in the dugout after being removed from the game during the sixth inning in the game between the Chicago Cubs and

Neil walker hi-res stock photography and images - Page 3 - Alamy

Pittsburgh Pirates starting pitcher A.J. Burnett (34) throws in the first inning against the Cincinnati Reds at PNC Park in Pittsburgh, on June 25, 2015. Photo by Archie Carpenter/UPI Stock Photo - Alamy

19 June 2015: Pittsburgh Pirates shortstop Jordy Mercer (10) warms up at Nationals Park in Washington, D.C. where the Washington Nationals defeated the Pittsburgh Pirates, 4-1. (Icon Sportswire via AP Images Stock Photo - Alamy

Infield single hi-res stock photography and images - Page 5 - Alamy

19 June 2015: Pittsburgh Pirates shortstop Jordy Mercer (10) warms up at Nationals Park in Washington, D.C. where the Washington Nationals defeated the Pittsburgh Pirates, 4-1. (Icon Sportswire via AP Images Stock Photo - Alamy

Pittsburgh Pirates' A.J. Burnett (34) throws against the Chicago Cubs in the first inning of a baseball game on Monday, April 20, 2015, in Pittsburgh. (AP Photo/Keith Srakocic Stock Photo - Alamy

Infield single hi-res stock photography and images - Page 5 - Alamy