Players plan to wear Strikeout Cancer T-shirts during the day and practice with a large backward K (a strikeout looking) and team colors emblazoned on it. Fans can join them by purchasing the shirt at www.108stitches.com and wearing them to the games.
Proceeds from each shirt are split between the players' chosen charities, in the Royals' case the Friends of Kids with Cancer, and the Jason Motte Foundation established by the St. Louis relief pitcher.
The Players Association will make a donation to the brain tumor program at Columbia University Medical Center in memory of former MLBPA executive director Michael Weiner, who passed away from brain cancer.
Dick Kaegel is a reporter for MLB.com. Jackson Alexander is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.