Gary Gilmour, Australia 6/14 (1975 World Cup)
One of the several Aussies on this list, Gary was the first to the 6 wicket mark as he led Australia past England with stunning figures of 6/14 at the start of the innings, reducing the English to 6/36 at home in Leeds.
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The left-handed seam bowler also contributed with the bat to top score with 28 to take Australia past a meager total of 94 set by the English.
Winston Davis, West Indies 7/51 (1983 World Cup)

Winston Davis (Image: facebook)
Playing his debut game, Davis shone for the West Indies as he ran through a powerful Australian middle order, picking up seven wickets, the first of its kind in the 1983 World Cup in Australia.
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His figures of 7/51 still stand as the best by any West Indian in the World Cup. The record stood as the best for 20 years before Glenn McGrath broke it in 2003.
Tim Southee, New Zealand 7/33 (2015 World Cup)

Tim Southee (Image:facebook)
Tim Southee came into his own in Wellington in 2015 as England were at the receiving end of fine display swing and seam bowling to be bowled out for 123, one of their lowest totals in World Cup history.
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Southee ran through the top, middle and a bit of the lower order to register the best figures in a World Cup game for a Kiwi. He took New Zealand to the Finals of the 2015 World Cup, only to be deprived of the big prize by arch-rivals Australia.
Andy Bichel, Australia 7/20 (2003 World Cup)
https://www.youtube.com/watch?v=M3OTSQAlKtE
Glenn McGrath had wreaked havoc three days earlier. Against fierce rivals England, Andy Bichel came up with the goods as he took 7 of the 8 English wickets to fall to finish with mesmerizing figures of 7/20.
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The all-rounder wasn’t done with his heroics with the ball, he came up to deliver with the bat as well as he scored a 38 ball 34 to guide the Aussies home from a precarious situation.
Glenn McGrath, Australia 7/15 (2003 World Cup)
The master of seam bowling, Glenn McGrath returned with figures of 7/15 as he rattled through minnows Namibia to bowl them out for a meager 45. Earlier, the Australians had posted a huge 301 on the board.
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McGrath’s figures stand out as the best bowling figures in the history of the World Cup and he is only one of the four men to have taken 7 wickets in a World Cup innings.