Slinger Bag has signed an endorsement deal with Tommy Haas, an Olympic silver medalist in tennis who was formerly ranked second in the world by the ATP. Haas will be serving as the combination ball launcher and carrier’s chief ambassador, heading up a roster that includes the doubles players Bob and Mike Bryan and a famous tennis coach, Nick Bollettieri. Haas won his first ATP title in 1999 and about 15 singles titles over a 22-year career. He will be representing the brand at clinics and other events as well as on social media.