In the summer of 1994, Jonny Walker played for the Memphis Jackals of the USISL. He then played one season with the University of Louisville and still holds the record for most saves in a match for (17) versus Evansville (9-8-94). He also has the most saves in a single season for a Cardinal with 151 (1994). He was named to the All-Metro Conference First Team in 1994. Walker represented the University of Louisville at the 1995 World University Games in Japan. He also participated in the 1995 Olympic Festival games in Denver, where he played for the South Team. Walker was one of only two goalkeepers in the country to be invited for full time residency at the ARCO Olympic Training Center in preparation for the '96 Olympic Games.