 Jaster spent most of 1966 in the big leagues where he finished with a record of 11–5 with an ERA of 3.26 which earned him a tie for 4th in the Rookie of the Year balloting for that season.The main highlight of Jaster's 1966 season, were his league leading five shutouts, all of which were against the NL pennant winning Los Angeles Dodgers.Because of his success against Los Angeles, some people nicknamed Jaster 'The Dodger Killer'.