Brian Lara's West Indians find themselves in a must-win situation after losing to defending champions Australia and New Zealand in their first two matches in the second round.
When asked whether the West Indies' form was an advantage for Sri Lanka, Moody replied: "I am not sure what the morale is like in the West Indies camp, but if it is down we will try to take advantage of it.
"They have come off two losses, so this is a big game for them.
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But it is equally as big for us. We are going in there all guns blazing, hoping to play our A game to get two points on the board at this stage of the competition.
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Mahela Jayawardene's Sri Lankans also need a win to boost their chances of qualifying for the semi-finals, having lost to South Africa by one wicket in a tense match here on Wednesday.
The West Indies have two points from three games and Sri Lanka two from as many matches.
Moody told his side to be on their toes as the under-pressure West Indies could strike back as they wou