Table schema:
CREATE TABLE table_name_53 (pl_gp INTEGER, pick__number VARCHAR, reg_gp VARCHAR, player VARCHAR)

Question: What is the lowest PI GP when the Reg GP is 1, Murray Bannerman is the Player, and the Pick # is under 58?
SQL: SELECT MIN(pl_gp) FROM table_name_53 WHERE reg_gp = 1 AND player = "murray bannerman" AND pick__number < 58