The group consisted of co-hosts Australia and New Zealand, and along with them, England, Sri Lanka, Bangladesh, Afghanistan and Scotland.
The opening game of the 2015 Cricket World Cup saw hosts New Zealand playing Sri Lanka.
Kumar Sangakkara (SL) moved into second place in the list of players with the most runs in ODI matches, overtaking Ricky Ponting (Aus).
[7] Captain George Bailey then joined Finch and the two added 146 runs in 26 overs for the fourth wicket.
[8] In the final over of the innings, Steven Finn removed Haddin for a 14-ball 31 and Maxwell for a 40-ball 66 off consecutive balls.
[9] Finn completed the hat-trick getting the wicket of Mitchell Johnson off the final ball,[9] and Australia finished at 342/9.
England's chase started with Mitchell Starc breaking the opening stand of 25, following which Marsh picked the next five wickets.
Trent Boult and Tim Southee picked up two wickets each within the first five overs of the innings which left Scotland at 12/4.
[20] New Zealand fast bowler Tim Southee picked up 7/33 in his 9 overs, which was the third-best haul in World Cup history.
[21] New Zealand's chase got off to a brisk start, mainly due to their captain Brendon McCullum who scored the fastest World Cup fifty reaching the landmark in just 18 balls.
[26] Asghar Stanikzai and Samiullah Shenwari built a steady third-wicket partnership which was broken when Afghanistan had reached 128 in the 28th over.
[26] Following this, Afghanistan started losing wickets at regular intervals to the Sri Lankan pace bowlers before finally being bowled out for 232 in 49.4 overs.
[43] Australia were left struggling at 106/9 at the end of 22 overs, before Brad Haddin and Pat Cummins put on 45 runs for the 10th wicket to take the Australian total to 151.
[44] New Zealand started off rapidly in their chase, thanks to a 21-ball fifty from their captain Brendon McCullum who took his team to 72/1 after 7 overs.
[45] With 6 runs needed from 27 overs, Williamson struck a six off the bowling of Cummins to give New Zealand a memorable one-wicket victory.
[47] Williamson ended up with an unbeaten 45 and the Man of the Match was awarded to Boult who had figures of 5/27 in his 10 overs, including three maidens.
[51] Kumar Sangakkara joined Thirimanne and the left-hand duo punished the England bowlers with each of the batsmen making hundreds.