Batting first, Afghanistan posted 169/8, powered by a late onslaught from Mohammad Nabi, who smashed five consecutive sixes off Wellalage in the final over to complete a half-century off just 19 balls.
Afghanistan collected 32 runs in that over, with Nabi eventually dismissed on the last ball for a blistering 59 off 22 deliveries.
Chasing 170, Sri Lanka reached the target with eight balls and six wickets in hand. Wellalage, however, endured a tough outing with the ball, conceding 49 runs in his 4 overs while taking one wicket.
At just 22 years of age, Wellalage is regarded as one of Sri Lanka’s most promising young talents, and news of his father’s passing has cast a shadow over his spirited journey.