Rizwan, originally from Kerala, struck 136-ball 109 while Lahore-born Usman's 102* came from 107 deliveries
Maiden ODI centuries for Chundangapoyil Rizwan and Muhammad Usman, who shared a fourth wicket partnership of 184, steered the UAE to an impressive six-wicket win over Ireland in the first of a four-match series Friday.
Chasing 270, Rizwan and Usman came together with UAE wobbling on 51 for three in the 13th over but they calmly rebuilt the innings until man-of-the-match Rizwan was removed for 109 with 35 runs still needed.
A quickfire unbeaten 10-ball 18 from Waheed Ahmed helped to guide them home with an over to spare, the experienced Usman finishing on 102 not out.
Ireland captain Andy Balbirnie won the toss and chose to bat.
Opener Paul Stirling paced himself superbly to bat through the innings and claim his 10th ODI century.
His 131 not out came off 148 balls and included nine fours and four sixes.
He shared a second wicket partnership of 102 with Balbirnie who made 53 from 61 balls but the innings faltered with the captain's dismissal.
Only three times in the 141-year history of Test cricket have a side won after following-on but when Pakistan Cricket...Posted by Sports Tribune on Wednesday, 16 May 2018
Ireland reached 269 for five from their 50 overs.
Leinster fast bowler Barry McCarthy ripped out openers Zawar Farid and Vriitya Aravind, and when Curtis Campher found the outside edge of Alishan Sharafu's bat, the home side were in serious trouble.
Rizwan, 32, and Usman, 35, dug in, though, for the next 33 overs to swing the game back to the hosts.
Rizwan, originally from Kerala in India, struck nine fours and a six in his 136-ball 109 while Lahore-born Usman's unbeaten 102 came from 107 balls and included seven fours and three sixes.
The second ODI takes place Sunday when UAE are still likely to be without vice-captain Chirag Suri and uncapped left-arm spinner Aryan Lakra who both missed Friday's opener after testing positive for Covid-19.
Since the New Year, the daily number of fresh Covid-19 cases in the country has averaged around 2000.
Following the UAE series, Ireland will remain in the country to play three ODIs against Afghanistan.
UAE 270/4 in 49 overs (Rizwan 109, Usman 102*) beat IRELAND 269/5 (Stirling 131*, Balbirnie 53) by six wickets