DA Warner of Australia scored 100 not out against Sri Lanka at Adelaide on 27.10.19 to provide the 52^nd occasion of an opening batsman scoring a century in T20Is. All such occasions are tabulated below

No	Player	Runs	Inns	Team	Oppn	Ground	Start Date
1	CH Gayle	117	1	Win	RSA	Johannesburg	11 Sep 2007
2	BB McCullum	116*	1	NZl	Aus	Christchurch	28 Feb 2010
3	M Jayawardene	100	1	Srl	Zim	Providence	03 May 2010
4	TM Dilshan	104*	1	Srl	Aus	Pallekele	06 Aug 2011
5	RE Levi	117*	2	RSA	NZl	Hamilton	19 Feb 2012
6	RD Berrington	100	1	Sco	Ban	The Hague	24 Jul 2012
7	MJ Guptill	101*	2	NZl	RSA	East London	23 Dec 2012
8	AJ Finch	156	1	Aus	Eng	Southampton	29 Aug 2013
9	AD Hales	116*	2	Eng	Srl	Chattogram	27 Mar 2014
10	Ahmed Shehzad	111*	1	Pak	Ban	Dhaka	30 Mar 2014
11	MN van Wyk	114*	1	RSA	Win	Durban	14 Jan 2015
12	RG Sharma	106	1	Ind	RSA	Dharamsala	02 Oct 2015
13	Mohd Shahzad	118*	1	Afg	Zim	Sharjah	10 Jan 2016
14	SR Watson	124*	1	Aus	Ind	Sydney	31 Jan 2016
15	Tamim Iqbal	103*	1	Ban	Oman	Dharamsala	13 Mar 2016
16	CH Gayle	100*	2	Win	Eng	Mumbai	16 Mar 2016
17	E Lewis	100	1	Win	Ind	Lauderhill	27 Aug 2016
18	GJ Maxwell	145*	1	Aus	Srl	Pallekele	06 Sep 2016
19	E Lewis	125*	2	Win	Ind	Kingston	09 Jul 2017
20	C Munro	109*	1	NZl	Ind	Rajkot	04 Nov 2017
21	RG Sharma	118	1	Ind	Srl	Indore	22 Dec 2017
22	C Munro	104	1	NZl	Win	Mt Maunganui	03 Jan 2018
23	MJ Guptill	105	1	NZl	Aus	Auckland	16 Feb 2018
24	AJ Finch	172	1	Aus	Zim	Harare	03 Jul 2018
25	(RG Sharma	100*	2	Ind	Eng	Bristol	08 Jul 2018
26	RG Sharma	111*	1	Ind	Win	Lucknow	06 Nov 2018
27	R Sandaruwan	103	2	Kuw	Bah	Al Amerat	23 Jan 2019
28	Hazratullah Zazai	162*	1	Afg	Ire	Dehradun	23 Feb 2019
29	TP Ura	107*	1	PNG	Phi	Port Moresby	23 Mar 2019
30	Awais Ahmed	102*	1	Esp	Mal	Cartagena	30 Mar 2019
31	Bilal Zalmai	111*	1	Aut	CZR	Ilfov County	01 Sep 2019
32	HG Munsey	127*	1	Sco	Net	Dublin (M)	16 Sep 2019
33	P Khadka	106*	2	Nep	Sin	Singapore	28 Sep 2019
34	KJ O’Brien	124	1	Ire	HKG	Al Amerat	07 Oct 2019
35	S Davizi	101	1	CZR	Mal	Marsa	20 Oct 2019
36	DA Warner	100*	1	Aus	Srl	Adelaide	27 Oct 2019

It also provides the fifth occasion of an Australian opening batsman scoring a century in a T20I. All such occasions are tabulated below

No	Player	Runs	Inns	Team	Oppn	Ground	Start Date
1	AJ Finch	156	1	Aus	Eng	Southampton	29 Aug 2013
2	SR Watson	124*	1	Aus	Ind	Sydney	31 Jan 2016
3	GJ Maxwell	145*	1	Aus	Srl	Pallekele	06 Sep 2016
4	AJ Finch	172	1	Aus	Zim	Harare	03 Jul 2018
5	DA Warner	100*	1	Aus	Srl	Adelaide	27 Oct 2019

It also provides the fourth occasion of an opening batsman scoring a century in a T20I against Sri Lanka. All such occasions are tabulated below

No	Player	Runs	Inns	Team	Oppn	Ground	Start Date
1	AD Hales	116*	2	Eng	Srl	Chattogram	27 Mar 2014
2	GJ Maxwell	145*	1	Aus	Srl	Pallekele	06 Sep 2016
3	RG Sharma	118	1	Ind	Srl	Indore	22 Dec 2017
4	DA Warner	100*	1	Aus	Srl	Adelaide	27 Oct 2019

AJ Finch {02}, C Munro {02}, CH Gayle {02}, E Lewis {02}, MJ Guptill {02} and RG Sharma {04} are the six opening batsmen who have scored centuries on two or more occasions in the annals of Twenty20 Internationals.

No	Player	Runs	Inns	Team	Oppn	Ground	Start Date
1	AJ Finch	156	1	Aus	Eng	Southampton	29 Aug 2013
2	AJ Finch	172	1	Aus	Zim	Harare	03 Jul 2018
1	C Munro	109*	1	NZl	Ind	Rajkot	04 Nov 2017
2	C Munro	104	1	NZl	Win	Mt Maunganui	03 Jan 2018
1	CH Gayle	117	1	Win	RSA	Johannesburg	11 Sep 2007
2	CH Gayle	100*	2	Win	Eng	Mumbai	16 Mar 2016
1	E Lewis	100	1	Win	Ind	Lauderhill	27 Aug 2016
2	E Lewis	125*	2	Win	Ind	Kingston	09 Jul 2017
1	MJ Guptill	101*	2	NZl	RSA	East London	23 Dec 2012
2	MJ Guptill	105	1	NZl	Aus	Auckland	16 Feb 2018
1	RG Sharma	106	1	Ind	RSA	Dharamsala	02 Oct 2015
2	RG Sharma	118	1	Ind	Srl	Indore	22 Dec 2017
3	RG Sharma	100*	2	Ind	Eng	Bristol	08 Jul 2018
4	RG Sharma	111*	1	Ind	Win	Lucknow	06 Nov 2018