Kansas City starter Danny Duffy threw just one pitch in Yankees Stadium on Saturday afternoon before he had to leave with an apparent arm injury.
Uh-oh, Duffy flinches after first pitch and he's coming out of the game.
— Vahe Gregorian (@vgregorian) September 6, 2014 
In 22 starts for the Royals this year, the left-handed starter has a 2.44 ERA. Obviously, if he is forced to miss time, that would be a huge blow for the Royals, who entered the game leading the Tigers, who lost earlier in the afternoon, by two-and-a-half games in the AL Central.
The official diagnosis: Danny Duffy was removed due to left shoulder soreness.
— Andy McCullough (@McCulloughStar) September 6, 2014 Check back for more updates as they become available.