Yahoo Sports reports: Rovman Powell hit a six in the final over Thursday to clinch a seven-wicket win for the West Indies over Sri Lanka in the first of three Twenty20 cricket matches. West Indies made a match of it with its late slow run rate chasing 147-9, despite scoring 66 runs in its first six overs. Needing 20 runs from 20 balls, it was reduced to needing a run a ball from nine balls before Powell clinched the win with the home side's 149-3 total with four balls remaining.