That I know of the record is as follows.

1. Saensak Muangsurin 3 (as noted by killer)
2. Jeff Fenech 7 fights
3. Leon Spinks & Davey Moore 8 fights
4. Nobuo Nashiro 9 fights

Quote Originally Posted by Pernell "Sweet Pea" Whitaker
Pete Rademacher
Rafael Lovera
It should be noted that these 2 guys did not become champions.