UPDATE 3-Cricket-Dilshan sparkles as Sri Lanka crush West Indies

* Opener Dilshan bats through Sri Lanka innings

* Mathews takes three wickets in first over

* Gayle also carries bat in West Indies innings

* Winners fined for slow over rate

(Adds Sri Lanka fines, last para)

By John Mehaffey LONDON, June 19 (Reuters) - Sri Lanka overwhelmed West Indies with bat and ball at the Oval on Friday to win their Twenty20 World Cup semi-final by 57 runs with 14 balls to spare.

Sri Lanka will meet Pakistan, who defeated South Africa on Thursday, in Sunday's final at Lord's (1400GMT).

Man-of-the-match Tillakaratne Dilshan came within four runs of the first century of the tournament, batting through the innings to finish on 96 not out from 57 balls in Sri Lanka's 158 for five.