Presuming you're referring to the Super Bowl, this was Super Bowl XXIV - which took place as part of the 1989 football season, the game being played on January 28, 1990.
Super Bowl 24.
Through Super Bowl XLIII, the largest margin of defeat is 45 points, when the Denver Broncos were defeated by the San Francisco 49ers by a score of 55-10 in Super Bowl XXIV played on 1/28/1990.
The San Francisco 49ers and the Denver Broncos. The 49ers won 55-10.
The cast of Super Bowl XXIV - 1990 includes: Steve Atwater as Himself - Denver Broncos Free Safety Harris Barton as Himself - San Francisco 49ers Right Tackle Mel Blount as Himself - Coin Toss Melvin Bratton as Himself - Denver Broncos Fullback Tyrone Braxton as Himself - Denver Broncos Left Cornerback Alphonso Carreker as Himself - Denver Broncos Left Defensive End Darren Carrington as Himself - Denver Broncos Defensive Back Mike Cofer as Himself - San Francisco 49ers Kicker Bruce Collie as Himself - San Francisco 49ers Right Guard Roger Craig as Himself - San Francisco 49ers Running Back Irv Cross as Himself - Sideline Reporter Keith DeLong as Himself - San Francisco 49ers Linebacker Rick Dennison as Himself - Denver Broncos Left Inside Linebacker Mike Ditka as Himself - Studio Analyst John Elway as Himself - Denver Broncos Quarterback Terrance Flagler as Himself - San Francisco 49ers Running Back Simon Fletcher as Himself - Denver Broncos Right Outside Linebacker Pete Fountain as Himself - Halftime Performer Charles Haley as Himself - San Francisco 49ers Left Outside Linebacker Patrick Hegarty as Himself - Reserve Quarterback Barry Helton as Himself - San Francisco 49ers Punter Wymon Henderson as Himself - Denver Broncos Right Cornerback Pierce Holt as Himself - San Francisco 49ers Left Defensive End Bobby Humphrey as Himself - Denver Broncos Running Back Dick Jorgensen as Himself - Referee Jim Juriga as Himself - Denver Broncos Left Guard Keith Kartz as Himself - Denver Broncos Center Clarence Kay as Himself - Denver Broncos Tight End Doug Kershaw as Himself - Halftime Performer Greg Kragen as Himself - Denver Broncos Nose Tackle Gary Kubiak as Himself - Denver Broncos Quarterback Pete Kugler as Himself - San Francisco 49ers Nose Tackle Ken Lanier as Himself - Denver Broncos Right Tackle Ronnie Lott as Himself - San Francisco 49ers Free Safety Will McDonough as Himself - Sideline Reporter Guy McIntyre as Himself - San Francisco 49ers Left Guard Tim McKyer as Himself - San Francisco 49ers Defensive Back Karl Mecklenburg as Himself - Denver Broncos Right Inside Linebacker Matt Millen as Himself - San Francisco 49ers Left Inside Linebacker Orson Mobley as Himself - Denver Broncos Tight End Joe Montana as Himself - San Francisco 49ers Quarterback Ricky Nattiel as Himself - Denver Broncos Wide Receiver Aaron Neville as Himself - National Anthem Performer Bubba Paris as Himself - San Francisco 49ers Left Tackle Wade Phillips as Himself - Denver Broncos Defensive Coordinator Darryl Pollard as Himself - San Francisco 49ers Left Cornerback Tom Rathman as Himself - San Francisco 49ers Fullback Dan Reeves as Himself - Denver Broncos Head Coach Jerry Rice as Himself - San Francisco 49ers Wide Receiver Randy Robbins as Himself - Denver Broncos Defensive Back Bill Romanowski as Himself - San Francisco 49ers Linebacker Jesse Sapolu as Himself - San Francisco 49ers Center George Seifert as Himself - San Francisco 49ers Head Coach Steve Sewell as Himself - Denver Broncos Running Back Art Shell as Himself - Coin Toss Mike Sherrard as Himself - San Francisco 49ers Wide Receiver Kenny Stabler as Himself - Studio Analyst Danny Stubbs as Himself - San Francisco 49ers Defensive End Pat Summerall as Himself - Play-by-play Announcer Harry Sydney as Himself - San Francisco 49ers Running Back Irma Thomas as Herself - Halftime Performer Andre Townsend as Himself - Denver Broncos Defensive End David Treadwell as Himself - Denver Broncos Kicker Keena Turner as Himself - San Francisco 49ers Right Outside Linebacker Wesley Walls as Himself - San Francisco 49ers Tight End Doug Widell as Himself - Denver Broncos Right Guard Sammy Winder as Himself - Denver Broncos Running Back Willie Wood as Himself - Coin Toss Steve Young as Himself - San Francisco 49ers Quarterback
Twelve - the Broncos and 49ers are tied 6-6 in regular season games.
San Francisco beat the Denver Broncos 55-10.
Preseason Week 1Denver Broncos at. San Francisco 49ers - Aug 8-11(TBD)As of April 7th, 2013
The Denver Broncos lost Superbowl bowls to the Dallas Cowboys, New York Giants, Washington Redskins, and the San Francisco 49ers.
San Francisco 49ers defeated Denver Broncos by a score of 55 to 10.
San Francisco 49ers with a 55-10 victory over the Denver Broncos
Cincinnati Bengals twice Miami Dolphins Denver Broncos San Diego Chargers
Cowboys - with 3 wins in 1993, 1994, 1996 49ers and Broncos tie for second with 2 wins each 49ers won in 1990 & 1995 Broncos won in 1998 & 1999 Other 90s winners are: Giants 1991 Redskins 1992 Packers 1997
Bill Romanowski was on 4 Super Bowl winning teams. 1988, Super Bowl XXIII, San Francisco 49ers 1989, Super Bowl XXIV, San Francisco 49ers 1997, Super Bowl XXXII, Denver Broncos 1998, Super Bowl XXXIII, Denver Broncos