The biggest 50 over tournament, ICC Cricket World Cup 2015, began today. In the opening encounter co-hosts New Zealand are taking on Sri Lanka in a Pool A match at Christchurch.Sri Lanka is chasing a target of 332 runs and were 13 for no loss in two overs when reports last came in.Asked to bat first by the Lankans, Kiwis posted a mammoth total of 331 runs for loss of 6 wickets. The co-hosts were off to a flying start as Skipper Brendon McCullum and Martin Guptil had a 111 run first wicket partnership in just 15.5 overs. Later on the innings were anchored by Corey Anderson and Luke Ronchi. For Sri Lanka Suranga Lakmal and Jeevan Mendis were pick of bowlers as they took 2 wickets each.A little drama unfolded in 47th over when Lasith Malinga clean bowled Luke Ronchi, but after being looked by TV umpire was called a no ball.In a short while from now, the other hosts Australia will open their world cup campaign against archrivals England at Melbourne Cricket Ground.