Their partnership saw Gilchrist going berzerk and he went on to play an unbeaten knock of 149 runs from just 104 balls to take Australia's total to 281/4 in 38 overs.
Hayden and Ricky Ponting played knocks of 38 and 37 respectively.
Gilchrist was suffering from a lack of form in the entire tournament. After the finals, the wicket-keeper batsman had revealed that he used a squash ball inside his gloves to help him in the innings.
ICC ODI WC 2007 final: While chasing the mammoth 282 (in 38 overs), Sri Lanka batted with almost no natural light at the end of the innings. Photo: @cricketcomau
Chasing 282, Sri Lanka was restricted to just 215/8 in the 36 overs. For the side, Kumar Sangakkara played a knock of 54 runs while for Australia, Michael Clarke scalped two wickets. Towards the end of Sri Lankan's innings, the match was played with almost no natural light.
Australia has won the 50-over World Cup five times (1987, 1999, 2003, 2007, and 2015).
Ricky Ponting led the World Cup-winning squad two times (2003 and 2007).
13 years ago today - Australia made World Cup history in the West Indies.@RickyPonting's memories of the 'farcical' finish: https://t.co/1EDltTEdhg pic.twitter.com/BHqwDbjp0G
— cricket.com.au (@cricketcomau) April 28, 2020
The 2007 World Cup-win was Australia's third in a row as they had previously won the tournament in 1999 and 2003.
In the 1999 finals, Australia defeated Pakistan while in 2003, the Kangaroos outclassed India.
WATCH: Australia vs Sri Lanka 2007 WC final highlights