CH Gayle of West Indies scored 12 boundary sixes in his knock of 135 against England at Bridgetown on 20 Feb 2019 to provide the 12th occasion of an opening batsman scoring ten or more boundary sixes in an innings in a one day international.  All such occasions are tabulated below

No	Player	Runs	6s	Inns	Team	Opp	Ground	Start Date
1	ST Jayasuriya	134	11	1	Srl	Pak	Singapore	02 Apr 1996
2	ML Hayden	181*	10	1	Aus	NZl	Hamilton	20 Feb 2007
3	BB McCullum	166	10	1	NZl	Ire	Aberdeen	01 Jul 2008
4	SR Watson	185*	15	2	Aus	Ban	Dhaka	11 Apr 2011
5	RG Sharma	209	16	1	Ind	Aus	Bengaluru	02 Nov 2013
6	CH Gayle	215	16	1	Win	Zim	Canberra	24 Feb 2015
7	MJ Guptill	237*	11	1	NZl	Win	Wellington	21 Mar 2015
8	Q de Kock	178	11	2	RSA	Aus	Centurion	30 Sep 2016
9	MJ Guptill	180*	11	2	NZl	RSA	Hamilton	01 Mar 2017
10	RG Sharma	208*	12	1	Ind	Srl	Mohali	13 Dec 2017
11	CH Gayle	123	11	1	Win	UAE	Harare	06 Mar 2018
12	CH Gayle	135	12	1	Win	Eng	Bridgetown	20 Feb 2019

CH Gayle, MJ Guptill and RG Sharma are the three opening batsmen who have scored ten or more sixes in an innings on two or more occasions. CH Gayle owns the record with three such occasions

No	Player	Runs	6s	Inns	Team	Opp	Ground	Start Date
1	CH Gayle	215	16	1	Win	Zim	Canberra	24 Feb 2015
2	CH Gayle	123	11	1	Win	UAE	Harare	06 Mar 2018
3	CH Gayle	135	12	1	Win	Eng	Bridgetown	20 Feb 2019
1	MJ Guptill	237*	11	1	NZl	Win	Wellington	21 Mar 2015
2	MJ Guptill	180*	11	2	NZl	RSA	Hamilton	01 Mar 2017
1	RG Sharma	209	16	1	Ind	Aus	Bengaluru	02 Nov 2013
2	RG Sharma	208*	12	1	Ind	Srl	Mohali	13 Dec 2017