KK Nair of India scored 303 not out against England in the ongoing test at Chennai to provide the 30^th occasion of a batsman scoring a triple century  in a test innings in the annals of test cricket. All such occasions are listed below

No	Player	Runs	Inns	Team	Oppn	Ground	Start Date
1	A Sandham	325	1	Eng	Win	Kingston	03 Apr 1930
2	DG Bradman	334	1	Aus	Eng	Leeds	11 Jul 1930
3	WR Hammond	336*	2	Eng	NZl	Auckland	31 Mar 1933
4	DG Bradman	304	2	Aus	Eng	Leeds	20 Jul 1934
5	L Hutton	364	1	Eng	Aus	The Oval	20 Aug 1938
6	Hanif Mohammad	337	3	Pak	Win	Bridgetown	17 Jan 1958
7	GS Sobers	365*	2	Win	Pak	Kingston	26 Feb 1958
8	RB Simpson	311	1	Aus	Eng	Manchester	23 Jul 1964
9	JH Edrich	310*	1	Eng	NZl	Leeds	08 Jul 1965
10	RM Cowper	307	2	Aus	Eng	Melbourne	11 Feb 1966
11	LG Rowe	302	2	Win	Eng	Bridgetown	06 Mar 1974
12	GA Gooch	333	1	Eng	Ind	Lord’s	26 Jul 1990
13	BC Lara	375	1	Win	Eng	St John’s	16 Apr 1994
14	ST Jayasuriya	340	2	Srl	Ind	Colombo (RPS)	02 Aug 1997
15	MA Taylor	334*	1	Aus	Pak	Peshawar	15 Oct 1998
16	Inzamam-ul-Haq	329	1	Pak	NZl	Lahore	01 May 2002
17	ML Hayden	380	1	Aus	Zim	Perth	09 Oct 2003
18	V Sehwag	309	1	Ind	Pak	Multan	28 Mar 2004
19	BC Lara	400*	1	Win	Eng	St John’s	10 Apr 2004
20	CH Gayle	317	2	Win	SAF	St John’s	29 Apr 2005
21	M  Jayawardene	374	2	Srl	SAF	Colombo (SSC)	27 Jul 2006
22	V Sehwag	319	2	Ind	SAF	Chennai	26 Mar 2008
23	Younis Khan	313	2	Pak	Srl	Karachi	21 Feb 2009
24	CH Gayle	333	1	Win	Srl	Galle	15 Nov 2010
25	MJ Clarke	329*	2	Aus	Ind	Sydney	03 Jan 2012
26	HM Amla	311*	2	SAF	Eng	The Oval	19 Jul 2012
27	KC Sangakkara	319	1	Srl	Ban	Chittagong	04 Feb 2014
28	BB McCullum	302	3	NZl	Ind	Wellington	14 Feb 2014
29	Azhar Ali	302*	1	Pak	Win	Dubai (DSC)	13 Oct 2016
30	KK Nair	303*	2	IndiN	Eng	Chennai	16 Dec 2016

His knock provides the third occasion of an Indian batsman to score a triple hundred in a test innings and he became the second Indian batsman to do so. All the three occasions are listed below

No	Player	Runs	Inns	Team	Oppn	Ground	Start Date
1	V Sehwag	309	1	Ind	Pak	Multan	28 Mar 2004
2	V Sehwag	319	2	Ind	SAF	Chennai	26 Mar 2008
3	KK Nair	303*	2	Ind	Eng	Chennai	16 Dec 2016

KK Nair’s 303 not out provide the ninth occasion of a batsman scoring a triple hundred against England in a test innings. All such occasions are listed below

No	Player	Runs	Inns	Team	Oppn	Ground	Start Date
1	DG Bradman	334	1	Aus	Eng	Leeds	11 Jul 1930
2	DG Bradman	304	2	Aus	Eng	Leeds	20 Jul 1934
3	RB Simpson	311	1	Aus	Eng	Manchester	23 Jul 1964
4	RM Cowper	307	2	Aus	Eng	Melbourne	11 Feb 1966
5	LG Rowe	302	2	Win	Eng	Bridgetown	06 Mar 1974
6	BC Lara	375	1	Win	Eng	St John’s	16 Apr 1994
7	BC Lara	400*	1	Win	Eng	St John’s	10 Apr 2004
8	HM Amla	311*	2	SAF	Eng	The Oval	19 Jul 2012
9	KK Nair	303*	2	Ind	Eng	Chennai	16 Dec 2016

BC Lara, CH Gayle, DG Bradman and V Sehwag are the four batsmen in the history of test cricket to score triple hundred on two occasions. The performance of these four batsmen are furnished below

No	Player	Runs	Inns	Team	Oppn	Ground	Start Date
1	BC Lara	375	1	Win	Eng	St John’s	16 Apr 1994
2	BC Lara	400*	1	Win	Eng	St John’s	10 Apr 2004
1	CH Gayle	317	2	Win	SAF	St John’s	29 Apr 2005
2	CH Gayle	333	1	Win	Srl	Galle	15 Nov 2010
1	DG Bradman	334	1	Aus	Eng	Leeds	11 Jul 1930
2	DG Bradman	304	2	Aus	Eng	Leeds	20 Jul 1934
1	V Sehwag	309	1	Ind	Pak	Multan	28 Mar 2004
2	V Sehwag	319	2	Ind	SAF	Chennai	26 Mar 2008

BC Lara and DG Bradman are the two batsmen who have scored two triple hundreds against the same opposition, same ground and in a test which has a start date in the same month

No	Player	Runs	Inns	Team	Oppn	Ground	Start Date
1	BC Lara	375	1	Win	Eng	St John’s	16 Apr 1994
2	BC Lara	400*	1	Win	Eng	St John’s	10 Apr 2004
1	DG Bradman	334	1	Aus	Eng	Leeds	11 Jul 1930
2	DG Bradman	304	2	Aus	Eng	Leeds	20 Jul 1934

Leeds and St John’s are the two grounds which have witnessed three triple centurions scored on it. The following table lists all such occasions

No	Player	Runs	Inns	Team	Oppn	Ground	Start Date
1	DG Bradman	334	1	Aus	Eng	Leeds	11 Jul 1930
2	DG Bradman	304	2	Aus	Eng	Leeds	20 Jul 1934
3	JH Edrich	310*	1	Eng	NZl	Leeds	08 Jul 1965
1	BC Lara	375	1	Win	Eng	St John’s	16 Apr 1994
2	BC Lara	400*	1	Win	Eng	St John’s	10 Apr 2004
3	CH Gayle	317	2	Win	SAF	St John’s	29 Apr 2005

Bridgetown, Chennai, Kingston and The Oval are the four grounds to witness two triple hundreds scored on it. The following table lists all such occasions

No	Player	Runs	Inns	Team	Oppn	Ground	Start Date
1	Hanif Mohammad	337	3	Pak	Win	Bridgetown	17 Jan 1958
2	LG Rowe	302	2	Win	Eng	Bridgetown	06 Mar 1974
1	V Sehwag	319	2	Ind	SAF	Chennai	26 Mar 2008
2	KK Nair	303*	2	Ind	Eng	Chennai	16 Dec 2016
1	A Sandham	325	1	Eng	Win	Kingston	03 Apr 1930
2	GS Sobers	365*	2	Win	Pak	Kingston	26 Feb 1958
1	L Hutton	364	1	Eng	Aus	The Oval	20 Aug 1938
2	HM Amla	311*	2	SAF	Eng	The Oval	19 Jul 2012