Paddy Power's "tennis insurance" typically refers to a promotion that offers a refund on bets if your selection loses due to a final set tiebreaker; it provides a safety net for punters in specific match scenarios. In contrast, "tennis acca insurance" pertains to accumulator bets, where you can receive a refund on your stake if one leg of your multiple bet fails. Essentially, while both promotions provide a form of protection for tennis bets, "tennis insurance" applies to individual match bets with specific loss conditions, whereas "tennis acca insurance" is designed for multi-bet scenarios, covering the entire accumulator wager.