With nostalgia and so many famous faces, it felt like old times in Oakland again — at least for a day. Mark Kotsay and Bob Melvin and Miguel Tejada felt it. Same for Mark Canha and Matt Chapman, a couple of former Athletics stars now wearing the rival’s jersey. Even for a teary and touched José Canseco, one of the newest members of the Athletics Hall of Fame who never saw this honor coming. The A’s and Giants played the first of two games that will mark the final Bay Bridge Series in Oakland. The A’s defeated the Giants 2-0 in the first game on Saturday before a season-high 37,551 fans for the matinee.