He pitched effectively in relief for Chicago, winning his two decisions and posting a 3.00 ERA, but that December he was traded again, this time to the Philadelphia Athletics. However, Klieman was ineffective in five  relief appearances and was sent to the minor leagues, where he finished his pro career in 1951.
A pitcher for Chicago had a successful stint in relief, earning two wins and a 3.00 ERA, but by December, he was traded again, this time to the Philadelphia Athletics. Unfortunately, Klieman's performance declined, and he was demoted to the minor leagues, where his professional career ended in 1951.