6- Mitch WIlliams (1991-1993)
Williams may be known for giving up the series deciding home run in the 1993 World Series, however the Phillies likely never make it to the series without the help of Williams. It was not always pretty with “Wild Thing” on the mound, but generally the job was done. Williams saved 102 games for the Phillies, including 43 in 1993. He also had 12 wins, a 2.34 ERA and sixth in the Cy Young Award voting in 1991. Sadly, Williams never regained form after the World Series defeat and posted a 7.96 ERA for three teams over parts of 1994, 1995 and 1997 before retiring.
5- Billy Wagner (2004-2005)
Wagner likely would be higher on this list had he pitched for more than two seasons with the Phillies. He was dominating while in Philadelphia, posting a 2.42 ERA in 2004 and 1.51 ERA in a league leading 70 appearances in 2005. Wagner averaged over 10 strikeouts per nine innings and a ridiculously low 0.81 WHIP in 120 games with the Phillies, while saving 59 games.