Dubai: All-rounder Angelo Mathews slammed 50 off 34 balls to help Sri Lanka reach 145 for five in the first T20I at the Dubai International Stadium, here, on Wednesday.
Mathews hit five boundaries and a six en route his half-century.
Apart from him, Lahiru Thirimanne scored 23 off 16 balls and captain Dinesh Chandimal hit a run-a-ball 22 to help their cause.
For Pakistan, Sohail Tanvir and Saeed Ajmal scalped two wickets apiece, while Shaid Afridi got one wicket.
Earlier, Pakistan opted to bowl first because captain Mohammed Hafeez believed the pitch was a tough one to set a target on and late evening dew may also hamper the side bowling second.
Nineteen-year-old left-armer Usman Khan made his international debut for Pakistan, but Junaid Khan was left out of the XI.