Marcus O'Brien - Teams Played Against
| Team | Games | Tries | Goals | DropGoals | Points | First Game Against | Last Game Against |
|---|---|---|---|---|---|---|---|
| Barrow Raiders | 4 | 0 | 0 | 0 | 0 | 27 Jun 2021 | 07 Apr 2023 |
| Batley Bulldogs | 3 | 1 | 0 | 0 | 4 | 01 May 2022 | 26 Mar 2023 |
| Bradford Bulls | 2 | 1 | 0 | 0 | 4 | 20 Mar 2022 | 05 Feb 2023 |
| Dewsbury Rams | 2 | 0 | 0 | 0 | 0 | 24 Apr 2022 | 21 Aug 2022 |
| Doncaster | 4 | 1 | 0 | 0 | 4 | 23 Feb 2020 | 10 Oct 2021 |
| Featherstone Rovers | 3 | 1 | 0 | 0 | 4 | 13 Feb 2022 | 19 Feb 2023 |
| Halifax Panthers | 2 | 0 | 0 | 0 | 0 | 27 Mar 2022 | 17 Jul 2022 |
| Keighley Cougars | 3 | 1 | 0 | 0 | 4 | 01 Mar 2020 | 26 Sep 2021 |
| Leigh Leopards | 1 | 0 | 0 | 0 | 0 | 22 May 2022 | 22 May 2022 |
| London Broncos | 3 | 1 | 0 | 0 | 4 | 02 Jun 2022 | 11 Mar 2023 |
| London Skolars | 1 | 0 | 0 | 0 | 0 | 16 May 2021 | 16 May 2021 |
| Newcastle Thunder | 2 | 0 | 0 | 0 | 0 | 08 Mar 2020 | 26 Jun 2022 |
| North Wales Crusaders | 2 | 1 | 0 | 0 | 4 | 23 May 2021 | 22 Aug 2021 |
| Rochdale Hornets | 1 | 0 | 0 | 0 | 0 | 20 Jun 2021 | 20 Jun 2021 |
| Sheffield Eagles | 1 | 0 | 0 | 0 | 0 | 15 Mar 2020 | 15 Mar 2020 |
| Swinton Lions | 1 | 0 | 0 | 0 | 0 | 26 Feb 2023 | 26 Feb 2023 |
| Toulouse Olympique | 1 | 0 | 0 | 0 | 0 | 04 Mar 2023 | 04 Mar 2023 |
| West Bowling | 1 | 0 | 0 | 0 | 0 | 16 Feb 2020 | 16 Feb 2020 |
| West Wales Raiders | 1 | 0 | 0 | 0 | 0 | 04 Jul 2021 | 04 Jul 2021 |
| Whitehaven | 2 | 1 | 0 | 0 | 4 | 17 Apr 2022 | 04 Sep 2022 |
| Widnes Vikings | 1 | 0 | 0 | 0 | 0 | 03 Jul 2022 | 03 Jul 2022 |
| York Knights | 3 | 0 | 0 | 0 | 0 | 03 Apr 2022 | 19 Mar 2023 |