For Glamorgan
48 (45 fours, 3 sixes) SA Northeast (410*) v Leicestershire at Leicester (Grace Road), 2022
44 (40 fours, 4 sixes) DL Lloyd (313*) v Derbyshire at Sophia Gardens, 2022
41 (41 fours) SP James (309*) v Sussex at Colwyn Bay, 2000
41 (26 fours, 15 sixes) AHT Donald v Derbyshire at Colwyn Bay, 2016
40 (38 fours, 2 sixes) MJ Powell (299) v Gloucestershire at Cheltenham College, 2006
39 (39 fours) RG Duckfield (280*) v Surrey at The Oval, 1936
37 (31 fours, 6 sixes) MP Maynard (243) v Hampshire at Southampton, 1990
36 (36 fours) SP James(227) v Northamptonshire at Northampton, 1998
MJ Powell (198) v Durham at Chester-le-Street, 2003
35 (32 fours, 3 sixes) Majid Khan (191) v Somerset at Taunton, 1972
(32 fours, 3 sixes) RC Fredericks (228*) v Northamptonshire at Swansea, 1972
(35 fours) SP James (230*) v Leicestershire at Leicester (Grace Rd), 1995
(31 fours, 4 sixes) MP Maynard (214) v Lancashire at Sophia Gardens, Cardiff, 1996
Against Glamorgan
49 (49 fours) MB Loye (322*) for Northamptonshire at Northampton, 1998
43 (43 fours,) SJ Cook (313*) for Somerset at Sophia Gardens, Cardiff, 1990
42 (35 fours, 7 sixes) AN Prince (261) for Lancashire at Colwyn Bay, 2015
41 (41 fours) MA Atherton (268*) for Lancashire at Blackpool, 1999
40 (35 fours, 5 sixes) AI Kallicharran (243*) for Warwickshire at Edgbaston, 1983
(39 fours, 1 six) HD Ackerman (309*) for Leicestershire at Sophia Gardens, Cardiff, 2006
(35 fours, 5 sixes) DJ Vilas (266) for Lancashire at Colwyn Bay, 2019
38 (38 fours) AG Dipper (252*) for Gloucestershire at Gloucester, 1923
(37 fours) J Whitehouse (197) for Warwickshire at Edgbaston, 1980
(22 fours, 16 sixes) A Symonds (254*) for Gloucestershire at Abergavenny, 1995
37 (35 fours, 2 sixes) AN Petersen (286) for Lancashire at Colwyn Bay, 2016