PORSCHE RACING HISTORYMichael Keyser (USA)
1973 : Sebring 12 Hours - 2nd overall : Watkins Glen 6 Hours - 1st in class
4 February 1973 - Daytona 24 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 15 | Porsche 911 S | GT+2.0 | Michael Keyser (USA)/Tony Adamowicz (USA)/Bob Beasley (USA) | Toad Hall Motor Racing (USA) | 8th | 6th | 26th | 587 laps |
24 March 1973 - Sebring 12 Hours - Non Championship Race
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 1 | Porsche 911 Carrera RSR | 911 360 0755 | GTO | Michael Keyser (USA)/Milt Minter (USA) | Toad Hall Motor Racing (USA) | 2nd | 2nd | 5th | 225 laps |
21 July 1973 - Watkins Glen 6 Hours - World Championship for Makes
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 16 | Porsche 911 Carrera RSR | 911 360 0755 | GT | Michael Keyser (USA)/Milt Minter (USA) | Toad Hall Motor Racing (USA) | 8th | 1st | 15th | 168 laps |