In 1991, both the
Milwaukee Wave of the
National Professional Soccer League and the
Baltimore Blast of
Major Soccer League drafted Kelderman. He signed with the Blast, but the team and league collapsed at the end of the 1991–1992 season. In 1992, he signed with the expansion
Buffalo Blizzard of the National Professional Soccer League. He remained with the team through the end of the 1994–1995 season. In 1994, he signed with the
Milwaukee Rampage of
USISL, playing two seasons with them. In the fall of 1995, he moved to the
Tampa Bay Terror of the NPSL before moving to the
St. Louis Ambush for the end of the season. On February 7, 1996,
D.C. United selected Kelderman in the 8th round (80th overall) in the
1996 MLS Inaugural Player Draft. Kelderman played forty-two games over two seasons with United, winning the
1996 and
1997 MLS Cup as well as the
1996 U.S. Open Cup. On November 6, 1997, the
Miami Fusion selected Kelderman with the sixth pick in the
1997 MLS Expansion Draft. He played twenty-one games with the Fusion, but was waived on November 2, 1998. He then signed with the
New England Revolution for the 1999 season. The Revs waived him on December 2, 1999. In February 2000, Kelderman signed a three-year contract with the
Milwaukee Rampage and
Milwaukee Wave. He played four games with the Wave at the end of the season, then four more at the beginning of the 2000–2001 season. In the summer of 2000, he played for the Rampage. He retired from playing professionally in the fall of 2000. ==Coach==