Sri Lanka have never won a home one-day series against Pakistan before and are now eyeing a clean sweep.
Mahela Jayawardene scored a brisk 123 for his first one-day century in two years to help Sri Lanka overhaul a daunting 289-run target at the Rangiri International Stadium.
Pakistani former captain Zaheer Abbas said the defeat stressed the need for a major overhaul.
"The World Twenty20 win had hid all the weaknesses in the team and the cricket board," said Abbas, referring to Pakistan's triumph in England in June.
"The top man doesn't know much about the intricacies of cricket and is taking decisions to please his friends," Abbas said of Pakistan Cricket Board (PCB) chairman Ijaz Butt.
"From top to bottom we need changes.
"Since this board has taken over we have lost th