Mr Green's "Tennis Boost" feature typically offers enhanced odds or increased payouts on tennis bets for selected matches or tournaments. Generally, this feature allows bettors to maximize their potential winnings by placing wagers on specific betting markets that are designated as eligible for the boost. The terms and conditions may include stipulations such as minimum stake amounts, eligible events, the maximum amount that can be boosted, and requirements for successful bet placement. It's important to check Mr Green's official website or app for the most current and specific details regarding eligibility, exclusions, and other relevant information for the Tennis Boost feature.