Throughout the month of August, "Baseball Tonight" is asking its experts and you, SportsNation, to determine each franchise's three greatest players and crown one of them the all-time franchise cornerstone. Beginning with the Cardinals on Aug. 3 and running through the Dodgers on Aug. 31, the debate will unfold with the help of your votes and your e-mails in special "Chatter Up" segments. Voting includes all players in a franchise's history, regardless of location (Brooklyn and Los Angeles Dodgers) or name (Montreal Expos and Washington Nationals). Tune in to see the results for the Mariners at 10 p.m. ET on Aug. 19.