Several people were turfed out of the opening match of the Cricket World Cup today for trying to manipulate the betting.

Police confirmed a number of spectators from Christchurch's Hagley Oval, including some who were caught "courtsiding".

Courtsiding is when fans within venues relay information about incidents during games to people overseas immediately, taking advantage of broadcasting time delays to influence betting.

Police warn anyone caught trying this at the Cricket World Cup will be banned from all grounds involved in the tournament.

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Superintendent Sandy Manderson, operation commander for the tournament, said police could identify people who were courtsiding.

"We know what to look for. We are aware that people are attempting to operate at venues and they will be detected, evicted and trespassed from all venues.

"We will continue to ensure the Cricket World Cup is a success and an enjoyable and memorable experience for everyone involved."

Courtsiding is different from match-fixing, which is the manipulation of sporting events to achieve a pre-determined outcome. Courtsiding is not illegal in New Zealand, but it is a breach of the terms and conditions of Cricket World Cup tickets.