Career
Aust played for the Saint Louis Cardinals in 1965 and 1966. He batted and threw right-handed. Aust was signed by the Cardinals as an amateur free agent in 1961.
Aust"s only decision came on the Cardinal"s opening day in 1966 when he pitched 3 innings in relief.
After getting the first two batters out in the top of the 12th inning, he surrendered a hit to Dick Allen followed by an intentional walk to Bill White. Pinch-hitter John Herrnstein"s Reserve Bank of India single scored Allen leading to the Philadelphia Phillies" 3–2 victory.