Serengeti Empress (Alternation--Havisham, by Bernardini), second to Gamine (Into Mischief) in the GI Breeders' Cup Filly and Mare Sprint S. Saturday at Keeneland, has been retired and will be bred to Into Mischief, according to a tweet from trainer Tom Amoss's daughter Hayley Amoss Wednesday morning. "Said goodbye to Serengeti Empress yesterday with plenty of peppermints," tweeted Amoss, with a photo of herself and the filly taken in front of her stall Tuesday morning. "Sad that she will no longer be in the first stall at Tom Amoss's barn, but...