Pakistan captain Sarfraz Ahmed won the toss and sent Sri Lanka in to bat for the first Twenty20 international in Abu Dhabi on Thursday.
Pakistan, who won the preceding one-day international series 5-0, brought opener Ahmed Shehzad back into the side while pace spearhead Mohammad Amir -- unfit for the ODIs - was not included.
The second match will also be in Abu Dhabi on Friday, while the final game is in Lahore on Sunday.
Pakistan: Sarfraz Ahmed (capt), Fakhar Zaman, Ahmed Shehzad, Babar Azam, Shoaib Malik, Mohammad Hafeez, Imad Wasim, Shadab Khan, Hasan Ali, Faheem Ashraf, Usman Shinwari
Sri Lanka: Thisara Perera (capt), Dilshan Munaweera, Danushka Gunathilaka, Sadeera Samarawickrama, Ashan Priyanjan, Mahela Udawatte, Dasun Shanaka, Sachith Pathirana, Seekkuge Prasanna, Isuru Udana, Vikum Sanjaya