| Date | Transaction |
| 02-28-2009 | Greg Mayer has retired from the Chicago Dawgs. |
| 08-10-2008 | The Chicago Dawgs have moved J.D. Vant and Oscar Akin to the active roster. The Chicago Dawgs have moved Greg Mayer and Brian Odom to the inactive roster. |
| 09-05-2005 | The Chicago Dawgs have moved Greg Mayer to the active roster. |
| 08-08-2005 | The Chicago Dawgs have moved John Hennings, Pat McLaughry, Joe Cunningham, Ray Boozer, and Rick Parsons to the active roster. The Chicago Dawgs have moved Greg Mayer, Bill Frisch, Kenyon Jackson, David Parker, and Jonathan Pasqua to the inactive roster. |
| 08-25-2003 | The Chicago Dawgs have moved Greg Mayer to the active roster. The Chicago Dawgs have moved Andy Degrate to the inactive roster. |
| 08-25-2003 | The Chicago Dawgs have acquired Greg Mayer from the waiver wire. |
| 08-18-2003 | The Cleveland Ironmen have waived Greg Mayer. |
| 08-18-2003 | The Cleveland Ironmen have moved Kenyon Slaughter, Rankin Hunley, Duane Smith, Rockne Freitas, Rupe Andrew, Ralph Taylor, Ziggy Czarobski, Izzy Lang, Tom Noble, Chuck Guy, Tim Dobrus, Dat Claphan, and Art Clark to the active roster. The Cleveland Ironmen have moved Greg Mayer, Reggie Grimes, Henry Tanner, Steve Stydahar, Leonard Kellogg, Donnie Pearson, Rod Gunner, Jim Cronkhite, Wally Chambers, Carlos Johnson, Ken Ecklund, Ron Songin, Dan Moore, Bill Lueck, and Steve Thomas to the inactive roster. |
| 04-27-2003 | The Cleveland Ironmen have moved Howard Fleming, Donnie Pearson, Reggie Grimes, Sylvester Wilcox, Dan Moore, Frank Jacoby, Carlos Johnson, Ken Ecklund, Greg Mayer, Ron Bentz, Al Crawford, Renard Pittman, Keith Dwyer, and Rod Gunner to the active roster. The Cleveland Ironmen have moved Tom Noble, Anton Jones, Richie Aurora, Kenyon Slaughter, Izzy Lang, Duane Smith, Ziggy Czarobski, John Perko, Norm Pruce, Hull Whelan, Rankin Hunley, Doug Engles, Moses Branch, and Billy Joe Mantooth to the inactive roster. |
| 01-26-2003 | The Cleveland Ironmen have acquired Greg Mayer from the waiver wire; however, as he was traded or waived after the deadline and has not spent a full week on the wire, he will not be eligible for the postseason. |
| 01-26-2003 | The Cleveland Ironmen have waived Greg Mayer. |
| 01-26-2003 | The Cleveland Ironmen have acquired Greg Mayer from the waiver wire. |
| 09-02-2002 | The Cleveland Ironmen have waived Greg Mayer. |
| 09-02-2002 | The Cleveland Ironmen have moved Doug Engles, Larry Ford, Norm Pruce, Billy Joe Mantooth, Moses Branch, Jack Lee, Richie Aurora, and John Perko to the active roster. The Cleveland Ironmen have moved Howard Fleming, Ellery Hanson, Matt Hafen, Sylvester Wilcox, Renard Pittman, and Greg Mayer to the inactive roster. |
| 08-19-2002 | The Cleveland Ironmen have moved Ralph Taylor, Greg Mayer, Dat Claphan, Ray Mix, Keith Smith, Richard Wilner, Chris Romeo, Ziggy Czarobski, Kenyon Slaughter, Don Lamka, and Big Daddy Lipscomb to the active roster. The Cleveland Ironmen have moved Clarence Crutcher, Sylvester Wilcox, Leonard Kellogg, Rod Gunner, Donnie Pearson, Wilbur Colter, Clyde Holloway, Jim Cronkhite, Joe Record, John Lott, Al Sanchez, John Joe, Richard Langhorne, Rod Majors, and Rich Shepherd to the inactive roster. |
| 08-05-2002 | The Cleveland Ironmen have moved Bill McElroy, Al Scarbath, Duane Smith, Batiste Bean, Frank White, Grant Lee, Ellery Hanson, Chuck Guy, Gerald Howard, and Bill Fournet to the active roster. The Cleveland Ironmen have moved Greg Mayer, Henry Tanner, Al Crawford, David Hull, Whitney Allen, Burt Hart, Wilbur Colter, Lee Falls, Darrell Skladany, and Larry Crawford to the inactive roster. |
| 04-28-2002 | The Cleveland Ironmen have moved Greg Mayer, Al Crawford, David Hull, Rich Shepherd, John Lott, Howard Fleming, Donnie Pearson, Clyde Holloway, Rod Gunner, Keith Dwyer, Al Sanchez, Richard Langhorne, Darrell Skladany, John Joe, Carlos Johnson, Sylvester Wilcox, and Matt Hafen to the active roster. The Cleveland Ironmen have moved Kenyon Slaughter, Richie Aurora, Larry Ford, Billy Joe Mantooth, Ralph Taylor, Ziggy Czarobski, John Perko, Hull Whelan, Carl Parros, Izzy Lang, Chris Romeo, Tony Ruud, Norm Pruce, Jack Lee, Doug Engles, Moses Branch, and Big Daddy Lipscomb to the inactive roster. |
| 01-28-2002 | The Cleveland Ironmen have acquired Greg Mayer from the waiver wire; however, as he was traded or waived after the deadline and has not spent a full week on the wire, he will not be eligible for the postseason. |
| 01-28-2002 | The Cleveland Ironmen have waived Greg Mayer. |
| 01-28-2002 | The Cleveland Ironmen have acquired Greg Mayer from the waiver wire. |
| 01-27-2002 | The Cleveland Ironmen have automatically waived Greg Mayer to comply with the 53-man roster limit. |
| 01-20-2002 | The Cleveland Ironmen have acquired Greg Mayer from the waiver wire; however, as he was traded or waived after the deadline and has not spent a full week on the wire, he will not be eligible for the postseason. |
| 01-20-2002 | The Cleveland Ironmen have waived Greg Mayer. |
| 01-20-2002 | The Cleveland Ironmen have acquired Greg Mayer from the waiver wire. |
| 11-04-2001 | The Cleveland Ironmen have automatically waived Greg Mayer to comply with the 53-man roster limit. |
| 10-29-2001 | The Cleveland Ironmen have acquired Greg Mayer from the waiver wire; however, as he was traded or waived after the deadline and has not spent a full week on the wire, he will not be eligible for the postseason. |
| 10-29-2001 | The Cleveland Ironmen have waived Greg Mayer. |
| 10-29-2001 | The Cleveland Ironmen have acquired Greg Mayer from the waiver wire. |
| 08-27-2001 | The Providence Devine have waived Greg Mayer. |
| 08-26-2001 | The Providence Devine have acquired Greg Mayer from the waiver wire. |
| 08-12-2001 | The Edmonton Frostbite have waived Greg Mayer. |
| 09-04-2000 | The Edmonton Frostbite have moved Roman Hobbs, Corey Hicks, Kevin Beinor, Phil Coulter, Matt Harris, Roy Mitchell, Ralph Quillan, and Jim McInally to the active roster. The Edmonton Frostbite have moved Greg Mayer, George Dempsey, Greg Ragunas, and Tom Duncan to the inactive roster. |
| 08-20-2000 | The Edmonton Frostbite have placed Greg Mayer on the trade block. |
| 04-30-2000 | The Edmonton Frostbite have moved Greg Mayer, Keith Carter, Stephone Rossum, Peter Aldridge, and Greg Ragunas to the active roster. The Edmonton Frostbite have moved Pete Graham, Dave Suggs, Corey Hicks, Matt Harris, and John Janiak to the inactive roster. |
| 08-29-1999 | The Edmonton Frostbite have moved Travis Brostek, Corey Hicks, Mike Boso, Matt Harris, and Bob Pape to the active roster. The Edmonton Frostbite have moved Greg Mayer, Mark Zaeske, Keith Dwyer, Hunk Moynihan, and Tony Duhe to the inactive roster. |
| 01-31-1999 | The Edmonton Frostbite have acquired Greg Mayer from the waiver wire. |
| 11-02-1998 | The Edmonton Frostbite have waived Greg Mayer. |
| 08-31-1998 | The Edmonton Frostbite have moved Al Dawkins, Bob Pape, Matt Harris, Red Clancy, and Dave Suggs to the active roster. The Edmonton Frostbite have moved Bob Jacke, Greg Mayer, Tony Duhe, Greg Ragunas, and Doug Birlem to the inactive roster. |
| 08-10-1998 | The Edmonton Frostbite have moved Steve Weatherwax, Chuck Meese, Greg Mayer, and Doug Birlem to the active roster. The Edmonton Frostbite have moved Al Dawkins, Corey Hicks, Mike Hutson, and Dave Suggs to the inactive roster. |
| 10-13-1997 | The Edmonton Frostbite have moved Jevon Lasse to the active roster. The Edmonton Frostbite have moved Greg Mayer to the inactive roster. |
| 10-12-1997 | The Edmonton Frostbite have moved Greg Mayer and Petey Fletcher to the active roster. The Edmonton Frostbite have moved Al Jervey and L.R. Szakash to the inactive roster. |
| 08-25-1997 | The Edmonton Frostbite have moved Vic Clark, Milton Hunter, Al Jervey, and Mike Hutson to the active roster. The Edmonton Frostbite have moved Frank Jacoby, Greg Mayer, and Leroy Blackmon to the inactive roster. |
| 08-18-1997 | The Edmonton Frostbite have moved Greg Mayer to the active roster. The Edmonton Frostbite have moved Steve Weatherwax to the inactive roster. |
| 08-18-1997 | The Edmonton Frostbite have acquired Greg Mayer from the waiver wire. |
| 08-10-1997 | The Phoenix Prowlers have moved Art Rowe and Artie Mitchell to the active roster. The Phoenix Prowlers have moved Madre Summerall and John Hunt to the inactive roster. |
| 08-10-1997 | The Phoenix Prowlers have waived Greg Mayer. |
Cornerback