Coming in to bat in place of the injured Chris Gayle, the right hander wasted no time in hoisting Angelo Mathews for a six, taking 13 runs off the first over.His knock contained six fours and five sixes as West Indies — set 123 to win — reached 127-3 off 18.2 overs.
"After Gayle went out I told (Dwayne) Bravo, there was something about me, I was just feeling very pumped up," Fletcher told reporters. "When they told me I was going to open I told them I would be positive from ball one."
"I'm very, very happy," Fletcher added. "I've been playing T20 and as soon I get to 50 I've been out. I told myself to try and bat as deep as possible and see if those guys can bat around me. I am so happy and proud of myself, people can see that I can bat through.
"And I am happy that I can help my team to win. I hope I can continue the good form and also the team continue the good performance."
Earlier, Sri Lanka struggled after being put in to bat, reaching 122-9 from 20 overs.
The defending champion stumbled to 47-5 before a 44-run partnership between Angelo Mathews (20) and Thisara Perera (40). They took the score to 91 before Mathews was out in unusual fashion to an unintended edge off a full toss.
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