| Windy City Open 2020 | 02/28 01:30 | 7 | Salazar, Arturo v Grayson, Campbell | 3-1 | |
| Pittsburgh Open 2020 | 01/24 22:00 | 3 | Dessouky, Fares v Grayson, Campbell | 3-1 | |
| Pittsburgh Open 2020 | 01/23 23:00 | 8 | Fallows, Richie v Grayson, Campbell | 0-3 | |
| J.P. Morgan Tournament of Champions 2020 | 01/12 02:00 | 8 | Grayson, Campbell v Rosner, Simon | 0-3 | |
| J.P. Morgan Tournament of Champions 2020 | 01/09 20:15 | 7 | Grayson, Campbell v Lopez, Edmon | 3-0 | |
| World Team Championships | 12/19 23:24 | - | Willstrop, James v Grayson, Campbell | 11-5 | |
| World Team Championships | 12/17 18:10 | - | Grayson, Campbell v Chua Man Tong | 9-6 | |
| PSA World Championships | 11/08 13:00 | 7 | Grayson, Campbell v Asal, Mostafa | 0-3 | |
| US Open | 10/09 00:00 | 9 | Grayson, Campbell v Elshorbagy, Mohamed | 0-3 | |
| US Open | 10/06 20:45 | 8 | Grayson, Campbell v Douglas, Andrew | 3-0 | |
| US Open | 10/05 20:45 | 7 | Soliman, Youssef v Grayson, Campbell | 2-3 | |
| Oracle NetSuite Open 2019 | 09/26 23:45 | 8 | Grayson, Campbell v Cuskelly, Ryan | 0-2 | |
| Oracle NetSuite Open 2019 | 09/25 00:30 | 7 | Pilley, Cameron v Grayson, Campbell | 1-2 | |
| British Open 2019 | 05/21 16:45 | 8 | Rodriguez, Miguel v Grayson, Campbell | 3-1 | |
| British Open 2019 | 05/20 16:45 | 7 | Grayson, Campbell v Mueller, Nicolas | 3-2 | |
| Irish Squash Open 2019 | 04/27 15:00 | 1 | Mangaonkar, Mahesh v Grayson, Campbell | 0-3 | |
| Irish Squash Open 2019 | 04/26 19:00 | 2 | Grayson, Campbell v Mekbib, Daniel | 3-1 | |
| Irish Squash Open 2019 | 04/25 16:15 | 3 | Grayson, Campbell v Fallows, Richie | 3-1 | |
| Irish Squash Open 2019 | 04/24 15:15 | 8 | Grayson, Campbell v Ribadas, Carlos Cornes | 3-0 | |
| El Gouna International | 04/17 10:45 | 7 | Asal, Mostafa v Grayson, Campbell | 3-0 | |
| Imet Open 2016 | 02/24 20:45 | 8 | Grayson, Campbell v Au, Leo | 0-3 | |
| Imet Open 2016 | 02/23 20:45 | 7 | Grayson, Campbell v Lake, Nathan | 3-1 | |
| Pittsburgh Open 2020 | 02/08 00:20 | 8 | Salem, Zahed v Grayson, Campbell | 3-1 | |
| Pittsburgh Open 2020 | 02/06 23:20 | 7 | Elsherbini, Mohamed v Grayson, Campbell | 2-3 | |
| Imet Open 2016 | 01/29 22:00 | 7 | Grayson, Campbell v Hanson, Chris | 0-3 | |
| Imet Open 2016 | 01/18 20:00 | 8 | Ghosal, Saurav v Grayson, Campbell | 3-0 | |
| Imet Open 2016 | 01/16 22:30 | 7 | Grayson, Campbell v Au, Leo | 3-2 | |
| Imet Open 2016 | 12/04 12:00 | 8 | Ng, Eain Yow v Grayson, Campbell | 3-0 | |
| Imet Open 2016 | 12/03 10:00 | 7 | Tuominen, Olli v Grayson, Campbell | 0-3 | |
| Imet Open 2016 | 11/19 12:00 | 7 | Parker, George v Grayson, Campbell | 3-0 |