"take familiarity one step closer to contempt" means, I assume, that the two sides have played each other a lot recently (they are familiar to each other), and that one side has been so dominant that they are starting to feel contempt for the opposition. This wording is a play on the well-known saying "familiarity breeds contempt". "bowling with a bar of soap" means, I assume, that the ball behaves in a "slippery" way, due to the conditions and/or the skill of the bowlers.
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