He attended Creighton University, playing on the men's soccer team from 1990 to 1993.
[1] In December 1993, the Detroit Rockers of the National Professional Soccer League drafted DeFini in the first round.
[2] On November 15, 1994, the Kansas City Attack traded their 1994 first round draft pick to the Rockers for the rights to DeFini.
In the fall of 1997, DeFini rejoined the Omaha Flames for the USISL indoor season.
He spent the 1998 outdoor season playing for Omaha TKB in the Senior Men's Division of the Cornhusker State Games.