7 Wins, 20 Losses
| Date | Game Type | Upset Magnitude | |||
|---|---|---|---|---|---|
| 02/24/89 | Lost | Waterville-Mansfield 58 | Brewster 62 | Playoff | 0.544 |
| 12/09/89 | Lost | Waterville-Mansfield 43 | Brewster 61 | League | 4.704 |
| 01/19/90 | Lost | Waterville-Mansfield 58 | Brewster 59 | League | 4.704 |
| 02/20/90 | Lost | Waterville-Mansfield 45 | Bridgeport 51 | Playoff | 8.516 |
| 02/24/90 | Lost | Waterville-Mansfield 57 | Bridgeport 65 | Playoff | 8.516 |
| 01/25/91 | Won | Waterville-Mansfield 59 | Bridgeport 51 | League | 6.626 |
| 02/09/91 | Lost | Waterville-Mansfield 40 | Pateros 41 | League | 2.747 |
| 12/21/91 | Won | Waterville-Mansfield 64 | Bridgeport 53 | League | 7.244 |
| 01/11/92 | Lost | Waterville-Mansfield 47 | Oroville 50 | League | 8.356 |
| 01/17/92 | Lost | Waterville-Mansfield 60 | Liberty Bell 62 | League | 6.190 |
| 02/25/92 | Lost | Waterville-Mansfield 37 | Liberty Bell 47 | Playoff | 6.190 |
| 01/26/93 | Lost | Waterville-Mansfield 43 | Cashmere 56 | Non-league | 10.193 |
| 02/06/93 | Won | Waterville-Mansfield 69 | Bridgeport 54 | League | 5.902 |
| 12/02/16 | Won | Waterville-Mansfield 43 | Entiat 42 | Non-league | 5.612 |
| 01/05/17 | Lost | Waterville-Mansfield 37 | Oroville 44 | League | 3.207 |
| 01/24/17 | Lost | Waterville-Mansfield 37 | Bridgeport 43 | League | 14.176 |
| 01/26/17 | Lost | Waterville-Mansfield 47 | Soap Lake 54 | League | 13.106 |
| 01/09/18 | Won | Waterville-Mansfield 41 | Brewster 38 | League | 21.090 |
| 01/13/18 | Won | Waterville-Mansfield 51 | Liberty Bell 50 | League | 1.821 |
| 01/20/18 | Lost | Waterville-Mansfield 35 | Tonasket 41 | League | 1.569 |
| 12/04/18 | Won | Waterville-Mansfield 45 | Liberty Bell 42 | League | 0.156 |
| 02/02/19 | Lost | Waterville-Mansfield 54 | Lake Roosevelt 56 | League | 2.927 |
| 02/16/19 | Lost | Waterville-Mansfield 42 | Mabton 44 | Playoff | 0.079 |
| 12/10/19 | Lost | Waterville-Mansfield 44 | Liberty Bell 58 | League | 4.451 |
| 12/26/19 | Lost | Waterville-Mansfield 39 | Garfield-Palouse 46 | Non-league | 7.547 |
| 12/27/19 | Lost | Waterville-Mansfield 41 | Colton 51 | Non-league | 0.679 |
| 02/29/20 | Lost | Waterville-Mansfield 40 | Northwest Christian (Colbert) 45 | Playoff | 0.179 |
6 Wins, 3 Losses
| Date | Game Type | Upset Magnitude | |||
|---|---|---|---|---|---|
| 01/07/17 | Won | Waterville-Mansfield 43 | Lake Roosevelt 38 | League | 2.029 |
| 12/12/17 | Won | Waterville-Mansfield 65 | Tonasket 51 | League | 3.000 |
| 12/15/17 | Lost | Waterville-Mansfield 60 | Bridgeport 63 | League | 1.980 |
| 01/06/18 | Won | Waterville-Mansfield 60 | Lake Roosevelt 47 | League | 6.260 |
| 01/18/18 | Won | Waterville-Mansfield 48 | Manson 45 | League | 6.460 |
| 01/25/18 | Lost | Waterville-Mansfield 55 | Soap Lake 57 | League | 8.380 |
| 02/09/18 | Won | Waterville-Mansfield 70 | Liberty Christian 61 | Playoff | 11.350 |
| 12/14/18 | Lost | Waterville-Mansfield 51 | Soap Lake 52 | League | 4.084 |
| 01/11/19 | Won | Waterville-Mansfield 40 | Liberty Bell 39 | League | 3.630 |