| 22 | T Box* | Sussex v Kent | Brighton | 1845 |
| 22 | MGK Burgess (in 69 balls) | Sussex v Middlesex | Hove | 2018 |
* Some sources give Box’s score as 21.
The innings shown here are the highest known to us. Information on possible higher instances is welcome; please contact records@acscricket.com.
Thanks to Pelham Barton and Harry Watton
Last updated 17 December 2020