Most maiden overs in succession in a first-class match

For Glamorgan

14 (84 balls) PM Walker v Somerset at Glastonbury, 1969
12 (78 balls) JE McConnon v Derbyshire at Cardiff Arms Park, 1958
12 (76 balls) DJ Shepherd v Hampshire at Southampton, 1968

Against Glamorgan

14 (88 balls) JB Mortimore for Gloucestershire at Margam, 1962
14 (86 balls) B Langford for Somerset at Bath, 1960
13 (91 balls) JA Young for Middlesex at Lord`s, 1950