San Francisco
The San Francisco Dons in 1956. They went 29-0.
Nobody
Theoretically yes although it is extremely unlikely
WWE Champion, World Heavyweight Champion, World Tag Team Champion, WCW Tag Team Champion, Hardcore Champion, undefeated at WrestleMania (15-0)
No, Ronda is undefeated in MMA, having won 12 fights (3 by knockouts and 9 by armbar submission). She is the first and current UFC Women's Bantamweight Champion.
6 rounds this is how it works round 1 32 undefeated 2 16 undefeated 3 8 undefeated 4 4 5 2 6 1
Bill Goldberg, the professional wrestler, is two time champion in the WWE and enjoyed his reputation as undefeated champion. He is now retired and has become a TV Presenter on the DIY Channel.
Dennis Hogan, and Irishman, is now the middle weight boxing champion of Australia. He beat Nathan "King" Carrol for the title. He is undefeated after 16 bouts.
USC
Rocky Marciano, who retired undefeated with a record of 49 wins against zero losses.
1997 AMA 125cc Outdoor National Motocross Champion (Kawasaki) 1998 AMA 125cc Outdoor National Motocross Champion (Kawasaki) 1999 AMA 125cc Outdoor National Motocross Champion (Kawasaki) 2000 AMA 250cc Outdoor National Motocross Champion (Kawasaki) 2001 AMA 250cc Supercross Champion (Kawasaki) 2001 AMA 250cc Outdoor National Motocross Champion (Kawasaki) 2002 AMA 250cc Supercross Champion (Honda) 2002 AMA 250cc Outdoor National Motocross Champion (Honda) *Perfect Season: 24-0* 2003 AMA 250cc Supercross Champion (Honda) 2003 AMA 250cc Outdoor National Motocross Champion (Honda) 2004 AMA 250cc Outdoor National Motocross Champion (Honda) *Perfect Season: 24-0* 2005 AMA 250cc Supercross Champion (Suzuki) 2005 AMA 250cc Outdoor National Motocross Champion (Suzuki) 2006 AMA 250cc Supercross Champion (Suzuki) 2006 AMA 250cc Outdoor National Motocross Champion (Suzuki)