Highest scores by batsmen carrying their bat in first-class cricket

R Abel 357* out of 811 for Surrey v Somerset at The Oval, 1899
WG Grace 318* out of 528 for Gloucestershire v Yorkshire at Cheltenham, 1876
WH Ashdown 305* out of 560 for Kent v Derbyshire at Dover, 1935
RR Relf 272* out of 433 for Sussex v Worcestershire at Eastbourne, 1909
CF Hughes 270* out of 475 for Derbyshire v Yorkshire at Leeds, 2013
WU Tharanga 265* out of 450 for Ruhuna v Basnahira South at Colombo-Col, 2008/09
DS Jadhav 260* out of 492 for India A v Kenya at Nairobi-SU, 2004
NV Knight 255* out of 472 for Warwickshire v Hampshire at Birmingham, 2002
Khalid Latif 254* out of 458 for Karachi Blues v Peshawar at Rawalpindi, 2009/10
SS Tanna 253* out of 499 for Saurashtra v Baroda at Rajkot, 1991/92

10th wicket partnership of 50 or more in 4th innings of drawn County Championship match

109* MP Bicknell (85*) and IDK Salisbury (30*) for Surrey v Leicestershire at Leicester, 2001
Batted for about 2 and a half hours
74* DG Cork (82*) and P Aldred (7*) for Derbyshire v Surrey at The Oval, 1996
Batted for 87 minutes
57* J Stone (41*) and J Badcock (24*) for Hampshire v Worcestershire at Stourbridge, 1906
Batted for 35 minutes
51* R Clarke (61*) and OJ Hannon-Dalby (10*) for Warwickshire v Somerset at Taunton, 2013
Batted for 78 minutes and 21.1 overs
50* PD Watts (51*) and JG Williamson (13*) for Northamptonshire v Nottinghamshire at Nottingham, 1959
Only 20 minutes. They finished 4 runs short of victory

Century in first three matches against one opposition in the County Championship

vs Durham: AD Brown & MA Wagh
vs Essex: DL Haynes, DJ Hussey & TM Moody
vs Glamorgan: HD Ackerman
vs Hampshire: DI Gower
vs Lancashire: G Boycott
vs Leicestershire: CB Fry
vs Middlesex: FR Brown & MJ Chilton
vs Somerset: ER Dexter
vs Surrey: DS Sheppard & LWP Wells
vs Sussex: HW Lee

No player has scored a century in each of their first 4 matches against one team.

Len Hutton scored centuries in 7 consecutive Championship matches against Sussex between 1938 and 1949 but not from his debut against them.

Highest scores in successful 4th innings run-chases in the County Championhip

243* AI Kallicharran for Warwickshire v Glamorgan at Birmingham, 1983
232 G Cox for Sussex v Northamptonshire at Kettering, 1939
206* EH Hendren for Middlesex v Nottinghamshire at Nottingham, 1925
205* G Cox for Sussex v Glamorgan at Hove, 1947
205 GA Gooch for Essex v Worcestershire at Worcester, 1994
192* MA Carberry for Hampshire v Warwickshire at Southampton, 2007
190 MD Crowe for Somerset v Leicestershire at Taunton, 1984
186* DS Sheppard for Sussex v Leicestershire at Leicester, 1953
185* JG Wright for Derbyshire v Northamptonshire at Derby, 1982
183* W Larkins for Northamptonshire v Sussex at Northampton, 1984
183* SD Peters for Northamptonshire v Middlesex at Northampton, 2010
182* MJK Smith for Warwickshire v Gloucestershire at Stroud, 1959
182 D Kenyon for Worcestershire v Somerset at Kidderminster, 1949
182 JE Root for Yorkshire v Durham at Chester-le-Street, 2013
181 CWJ Athey for Gloucestershire v Sussex at Cheltenham, 1992
180* CG Greenidge for Hampshire v Derbyshire at Derby, 1986

For Yorkshire:
182 JE Root v Durham at Chester-le-Street, 2013
165* A McGrath v Leicestershire at Leicester, 2005
160 PA Jaques v Gloucestershire at Bristol, 2012
156* G Boycott v Glamorgan at Middlesbrough, 1976
154 G Boycott v Nottinghamshire at Nottingham, 1977
144 K Taylor v Derbyshire at Chesterfield, 1959
143 DB Close v Somerset at Taunton, 1955
137* D Denton v Leicestershire at Bradford, 1911
137 GH Hirst v Middlesex at Lord's, 1910
130* WB Stott v Hampshire at Hull, 1959

150 and 100 in a Test by a captain

A Melville 189 & 104* for South Africa v England at Nottingham, 1947
RB Simpson 153 & 115 for Australia v Pakistan at Karachi, 1964
SM Gavaskar 107 & 182* for India v West Indies at Calcutta, 1978/79
GA Gooch 333 & 123 for England v India at Lord's, 1990
BRM Taylor 171 & 102* for Zimbabwe v Bangladesh at Harare, 2013

Teams losing 5 wickets on the same total in a Test innings

New Zealand v Australia at Wellington, 1946. 37-2 to 37-7.
New Zealand v Pakistan at Rawalpindi, 1965. 59-4 to 59-9.
New Zealand v South Africa at Hamilton, 2012. 133-2 to 133-7.
Bangladesh v Zimbabwe at Harare, 2013. 134-5 to 134 all out.

Highest first-class scores v University teams in England

338 WW Read for Surrey v Oxford University at The Oval, 1888
306* A Ducat for Surrey v Oxford University at The Oval, 1919
304* ED Weekes for West Indians v Cambridge University at Cambridge, 1950
268 JC Hildreth for Somerset v Cardiff Marylebone Cricket Club University at Taunton, 2012
266* W Place for Lancashire v Oxford University at Oxford, 1947
261 JB Hobbs for Surrey v Oxford University at The Oval, 1926
256 SR Patel for Nottinghamshire v Durham MCCU at Nottingham, 2013
252* PR Umrigar for Indians v Cambridge University at Cambridge, 1959
248 TE Jesty for Hampshire v Cambridge University at Cambridge, 1984
247 AE Dipper for Gloucestershire v Oxford University at Bristol, 1924

Highest score on Championship debut for each team

Derbyshire: 186* CWG Bassano v Gloucestershire at Derby, 2001
Durham: 253 MEK Hussey v Leicestershire at Leicester, 2005
Essex: 181 HM Amla v Glamorgan at Chelmsford, 2009
Glamorgan: 160 BB McCullum v Leicestershire at Cardiff, 2006
Gloucestershire: 161* A Symonds v Surrey at The Oval, 1995
Hampshire: 272 JP Crawley v Kent at Canterbury, 2002
Kent: 146* DG Aslett v Hampshire at Bournemouth, 1981
Lancashire: 171 JER Gallian v Surrey at Manchester, 1994
Leicestershire: 261 PV Simmons v Northamptonshire at Leicester, 1994
Middlesex: 150 AC Voges v Warwickshire at Uxbridge, 2013
Northamptonshire: 210* DJG Sales v Worcestershire at Kidderminster, 1996
Nottinghamshire: 267 A Shrewsbury v Sussex at Nottingham, 1890
Somerset: 172 CL White v Gloucestershire at Bristol, 2006
Surrey: 192 RT Ponting v Warwickshire at Guildford, 2013
Sussex: 156 AW Greig v Lancashire at Hove, 1967
Warwickshire: 168 TM Moody v Derbyshire at Derby, 1990
Worcestershire: 129 BF Smith v Gloucestershire at Worcester, 2002
Yorkshire: 164 H Rudston v Leicestershire at Leicester-AR, 1904

Only two of this list were making their overall first-class debut: Aslett and Sales.
And, 10 (was 9 before 2013) of the list made their first-class debuts overseas.
The two whose records have been broken this season are:
Middlesex: 132* DJ Malan v Northamptonshire at Uxbridge, 2008
Surrey: 155 JB Hobbs v Essex at The Oval, 1905

Highest scores on Championship debut for Somerset

172 CL White v Gloucestershire at Bristol, 2006
167 AN Petersen v Surrey at The Oval, 2013
123 H Gimblett v Essex at Frome, 1935
116* BL Bisgood v Worcestershire at Worcester, 1907
115 MD Lyon v Worcestershire at Taunton, 1920
112 RT Ponting v Yorkshire at Scarborough, 2004
110* AN Hayhurst v Glamorgan at Cardiff, 1990
104* DB Close v Leicestershire at Leicester, 1971

Most consecutive wins in first-class cricket

18 Surrey from 11/8/1954 to 15/6/1955
16 Transvaal from 6/4/1903 to 4/1/1907
16 Australia from 26/12/2005 to 2/1/2008
15 Mashonaland from 24/3/2000 to 18/10/2002
14 Jamaica from 8/4/2011 to 25/4/2013
14 Lancashire from 27/7/1882 to 25/6/1883
14 Yorkshire from 6/6/1923 to 25/7/1923

Best bowling on Championship debut for Sussex

9-35 JEBBPQC Dwyer v Derbyshire at Hove, 1906
7-34 SJ Magoffin v Lancashire at Liverpool, 2012
7-44 GG Arnold v Lancashire at Manchester, 1978
6-43 KHC Woodroffe v Surrey at The Oval, 1914 *
6-45 RW Kentfield v Middlesex at Lord's, 1894
6-48 CJ Jordan v Yorkshire at Leeds, 2013
6-78 MA Robinson v Northamptonshire at Hove, 1997
6-152 PP Chawla v Worcestershire at Worcester, 2009

* His only Championship wickets for Sussex. He died in the War.
Dwyer's full names are here

Three South Africans as Wisden Cricketers of the Year:
1966: C Bland, G Pollock, P Pollock
1981: A Lamb, C Rice, V van der Bijl
2009: D Benkenstein, M Boucher, N McKenzie
2013: H Amla, J Kallis, D Steyn

1966 was the only previous time that 3 players from the SA touring team were honoured.

Seven wickets in an inns for University team versus county since 1965

7-79 ME Allbrook (Cambridge v Nottinghamshire, Cambridge, 1978)
8-68 KI Hodgson (Cambridge v Glamorgan, Cambridge, 1982)
8-94 LM Daggett (Durham UCCE v Durham, Chester-le-Street, 2004)
7-45 JE Lee (Leeds/Bradford v Yorkshire, Leeds, 2013)

Most wickets in season of first-class debut in South Africa

Most wickets in season of first-class debut in South Africa

MN Piedt 59 @ 16.93 in 13 matches, 2012/13
P Anker 50 @ 14.62 in 7 matches, 1981/82
T Shamsi 50 @ 21.64 in 11 matches, 2009/10
S von Berg 49 @ 23.34 in 12 matches, 2009/10
PR Adams 43 @ 24.76 in 8 matches, 1995/96
BL Whatmore 42 @ 20.47 in 11 matches, 2010/11
RH Kaschula 41 @ 14.82 in 7 matches, 1970/71
DP Conyngham 40 @ 14.52 in 6 matches, 1921/22
M de Lange 40 @ 23.8 in 10 matches, 2010/11