Seamer Thisara Perera (4-42) bagged a hat-trick as Sri Lanka, who scored 243-8, bowled Pakistan out for 199 despite a 113-run stand for third wicket between opener Azhar Ali (81 not out) and skipper Misbah-ul-Haq (57).
Kumar Sangakkara top-scored for Sri Lanka with a 130-ball 97 while off-spinners Mohammad Hafeez and Saeed Ajmal, and paceman Sohail Tanvir each bagged two wickets for Pakistan in the day-night match.
Pakistan won the opening one-dayer by six wickets and Sri Lanka won the second game by 76 runs in Pallekele, while the third match was abandoned due to rain in Colombo on Wednesday.
The fifth one-dayer will be played in Colombo on Monday.
Brief scores:
Sri Lanka 243-8 in 50 overs; Pakistan 199 in 45 overs
Amanda Bynes has been released from police custody and has returned home after appearing in court in New York on Friday morning (24.05.13) where she was formally charged with attempted evidence tampering, reckless endangerment and marijuana possession.
Toulon ended Toulouse's reign as French Top 14 champions with a 24-9 semi-final success on Friday to remain on course to complete a double.
