Lahiru Thirimanne scored his third ODI century while Jayawardene made 75 as Sri Lanka remained unbeaten in the tournament to win the title.
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Toss: Pakistan skipper Misbah-ul-Haq won the toss and opted to bat first against Sri Lanka in the Asia Cup final.
Team News: Pakistan have made two changes with Sharjeel Khan and Junaid Khan coming in, while Ajantha Mendis has been dropped by Sri Lanka.
The Sri Lankans, who had defeated the defending champions in the tournament opener, are yet to lose a match in the mega event of the sub-continent.
Pakistan's chances would depend on how they tame seasoned Kumar Sangakkara and handle the bowling of paceman Lasith Malinga and spinner Ajantha Mendis.