"prized urn" -- Not knowing much about cricket, I'd assume that this refers to a winner's trophy for whatever league these people play in. "Warne sideshow has reached fever pitch" -- This guy Warne is probably an odd character, so they call him a "sideshow", which is a reference to offbeat circus attractions. "Reached fever pitch" means that the excitement surrounding Warne is at a very high level.
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