"It's a happy day," said second baseman Christian Colon, who had an RBI double in a 5-4 loss to the Indians. "When you get to the ballpark and see all the cool pink, you want to put on as much pink as you can.
"It's an honor to go out there and represent breast cancer awareness, especially on Mother's Day. I know what my mom has done for me. She has worked hard. For all the moms around the world that stick it out through thick and thin, this is a special day for them with MLB. And it's a special day for us as well."
"It's a great thing what MLB has done with the pink attire and the cancer awareness," Duffy said. "It's what we need to be doing, to fight against this terrible disease that has affected so many people. It's a great way to help unify that fight."
Authentic game-used Louisville Slugger pink bats and other gear from Mother's Day games will be auctioned exclusively at MLB.com, with proceeds benefiting the fight against breast cancer. The complete Mother's Day collection -- which includes the special caps and jerseys being worn by players on Sunday -- is available at the MLB.com Shop.
Jeffrey Flanagan has covered the Royals since 1991, and for MLB.com since 2015. Follow him on Twitter @FlannyMLB. This story was not subject to the approval of Major League Baseball or its clubs.