Seven West Media has attempted to blow up its $450 million media rights deal with Cricket Australia, arguing in fresh court proceedings the sporting body breached its contract and undermined the success of the Big Bash League.

In proceedings filed in the Federal Court, Seven claims that CA breached its contract relating to quality and standards of the BBL, which has struggled to generate high TV ratings.

The Australian's media editor James Madden told Liam Bartlett on 6PR Mornings that Cricket Australia were "astonished" when they heard the news.

"It's a fairly complicated backstory between these two parties," he said.

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