William Hill's "Tennis Bet Boost" feature allows customers to enhance the odds on selected tennis matches, giving bettors the opportunity to receive greater returns on their wagers. Typically, this feature is available on specific games or tournaments, and users can opt to boost their bet before placing it. Terms and conditions usually include limits on the maximum stake eligible for the boost, time restrictions on when the boost can be applied, and eligibility criteria based on the customer’s account status. Additionally, bonuses from boosted bets may not be eligible for further promotions or bonuses. For the most accurate and up-to-date details, customers should refer to William Hill's official website or customer service.