Thumbless-style pioneer Mike Miller turned 50 in January, headling a short list of PBA Tour champions who will become eligible before or during the 2011 PBA Senior Tour season, PBA announced in its latest edition of Spare Shots. Also becoming eligible for the Senior Tour during the 2011 season, which kicks off in April, are six-time champion Dave D'Entremont on June 15 and PBA Hall of Famer Amleto Monacelli on Aug. 27, the starting date of the...