Scorecard
Matthew Hayden, who has hit three hundreds in this World Cup, was relatively subdued with Gilchrist doing the bulk of the scoring.
The Queenslander hit 38 from 55 balls, with the help of three fours and a six.
Both openers watched Lasith Malinga's opening overs carefully on a pitch unaffected by morning rain but enjoyed themselves at the other end at Chaminda Vaas's expense.
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The Cup: Complete coverage