Ireland 159 for 5 (Stirling 71, Balbirnie 34, Butt 2-19) beat Oman 144 for 9 (Nadeem 25, Butt 25; Singh 3-15) by 15 runs
Muscat: Paul Stirling led Ireland to a 15-run victory over Oman in the opening match of their Twenty20 Quadrangular Series.
Skipper Stirling struck 11 fours and scored 71 runs from 51 balls to steer his team to 159-5 at Al Amarat.
The home side made a strong start to their run-chase but collapsed from 70-3 to 92-7 as Ireland all-rounder Simi Singh took three wickets in an over.
Ireland return to action on Friday against Scotland, who lost to the Netherlands in their opening match.
In his first competitive game as Ireland's new T20 captain, Stirling combined with Andrew Balbirnie for a 78-run second-wicket partnership as the tourists' top-order piled on early runs.
Balbirnie's departure in the 15th over was followed just five balls later by Stirling to leave their side on 125-3, but the fifth-wicket pairing of Lorcan Tucker (22) and Shane Getkate (10) ensured that Ireland cruised beyond the 150 mark.
Opener Khawar Ali scored just five runs for the tournament hosts before his dismissal off the bowling of Joshua Little but Oman recovered through Jatinder Singh and Aamir Kaleem to reach 70-3 before Khurram Nawaz was bowled by George Dockrell, triggering a collapse as a further four wickets fell for just 22 runs.
Simi Singh was the pick of the Irish bowlers, taking all three of his wickets in a devastating 10th over to end any hopes of a home victory.