GJ Maxwell of Australia scored 145 not out against Sri Lanka at Pallekele on 06.09.16 to provide the 23^rd occasion of a batsman scoring a century in the history of T20 Internationals. All such occasions are listed below

No	Player	Runs	Inns	Team	Oppn	Ground	Start Date
1	AJ Finch	156	1	Aus	Eng	Southampton	29 Aug 2013
2	GJ Maxwell	145*	1	Aus	Srl	Pallekele	06 Sep 2016
3	SR Watson	124*	1	Aus	Ind	Sydney	31 Jan 2016
4	BB McCullum	123	1	NZl	Ban	Pallekele	21 Sep 2012
5	Babar Hayat	122	2	HKG	Oman	Fatullah	19 Feb 2016
6	F du Plessis	119	1	RSA	Win	Johannesburg	11 Jan 2015
7	Mohd Shahzad	118*	1	Afg	Zim	Sharjah	10 Jan 2016
8	RE Levi	117*	2	RSA	NZl	Hamilton	19 Feb 2012
9	CH Gayle	117	1	Win	RSA	Johannesburg	11 Sep 2007
10	BB McCullum	116*	1	NZl	Aus	Christchurch	28 Feb 2010
11	AD Hales	116*	2	Eng	Srl	Chittagong	27 Mar 2014
12	MN van Wyk	114*	1	RSA	Win	Durban	14 Jan 2015
13	Ahmed Shehzad	111*	1	Pak	Ban	Dhaka	30 Mar 2014
14	KL Rahul	110*	2	Ind	Win	Lauderhill	27 Aug 2016
15	RG Sharma	106	1	Ind	RSA	Dharamsala	02 Oct 2015
16	TM Dilshan	104*	1	Srl	Aus	Pallekele	06 Aug 2011
17	Tamim Iqbal	103*	1	Ban	Oman	Dharamsala	13 Mar 2016
18	MJ Guptill	101*	2	NZl	RSA	East London	23 Dec 2012
19	SK Raina	101	1	Ind	RSA	Gros Islet	02 May 2010
20	CH Gayle	100*	2	Win	Eng	Mumbai	16 Mar 2016
21	M Jayawardene	100	1	Srl	Zim	Providence	03 May 2010
22	RD Berrington	100	1	Sco	Ban	The Hague	24 Jul 2012
23	E Lewis	100	1	Win	Ind	Lauderhill	27 Aug 2016

GJ Maxwell’s 145 not out represent the second highest score by a batsman in T20I, the  highest being  AJ Finch’s 156  in the game between Australia  and England at Southampton on 29.08.13

No	Player	Runs	Inns	Team	Oppn	Ground	Start Date
1	AJ Finch	156	1	Aus	Eng	Southampton	29 Aug 2013
2	GJ Maxwell	145*	1	Aus	Srl	Pallekele	06 Sep 2016

GJ Maxwell became the third Australian batsman to score a century in T20Is after AJ Finch and SR Watson. The centuries scored by these three Australian batsmen are listed below. It is interesting to note that the runs scored by these three batsmen occupy the first three places in the history of T20Is

No	Player	Runs	Inns	Team	Oppn	Ground	Start Date
1	AJ Finch	156	1	Aus	Eng	Southampton	29 Aug 2013
2	GJ Maxwell	145*	1	Aus	Srl	Pallekele	06 Sep 2016
3	SR Watson	124*	1	Aus	Ind	Sydney	31 Jan 2016

GJ Maxwell became the second batsman to score a century against Sri Lanka in a T20I after AD Hales of England. AD Hales had scored 116 not out at Chittagong on 27.03.14

No	Player	Runs	Inns	Team	Oppn	Ground	Start Date
1	GJ Maxwell	145*	1	Aus	Srl	Pallekele	06 Sep 2016
2	AD Hales	116*	2	Eng	Srl	Chittagong	27 Mar 2014

GJ Maxwells 145 not out against Sri Lanka at Pallekele on 06.09.16 provide the 18^th occasion of an opening batsman scoring a century in the history of T20Is. GJ Maxwell’s 145 not out came when he batted at number for the first time in his T20I career

No	Player	Runs	Inns	Team	Oppn	Ground	Start Date
1	AJ Finch	156	1	Aus	Eng	Southampton	29 Aug 2013
2	GJ Maxwell	145*	1	Aus	Srl	Pallekele	06 Sep 2016
3	SR Watson	124*	1	Aus	Ind	Sydney	31 Jan 2016
4	Mohd Shahzad	118*	1	Afg	Zim	Sharjah	10 Jan 2016
5	RE Levi	117*	2	RSA	NZl	Hamilton	19 Feb 2012
6	CH Gayle	117	1	Win	RSA	Johannesburg	11 Sep 2007
7	BB McCullum	116*	1	NZl	Aus	Christchurch	28 Feb 2010
8	AD Hales	116*	2	Eng	Srl	Chittagong	27 Mar 2014
9	MN van Wyk	114*	1	RSA	Win	Durban	14 Jan 2015
10	Ahmed Shehzad	111*	1	Pak	Ban	Dhaka	30 Mar 2014
11	RG Sharma	106	1	Ind	RSA	Dharamsala	02 Oct 2015
12	TM Dilshan	104*	1	Srl	Aus	Pallekele	06 Aug 2011
13	Tamim Iqbal	103*	1	Ban	Oman	Dharamsala	13 Mar 2016
14	MJ Guptill	101*	2	NZl	RSA	East London	23 Dec 2012
15	CH Gayle	100*	2	Win	Eng	Mumbai	16 Mar 2016
16	M Jayawardene	100	1	Srl	Zim	Providence	03 May 2010
17	RD Berrington	100	1	Sco	Ban	The Hague	24 Jul 2012
18	E Lewis	100	1	Win	Ind	Lauderhill	27 Aug 2016