Sentinel secondary graduate Jack Karp, 18, gears up to host his fifth annual Do You Have the Balls to Beat Cancer Tennis-a-thon in support of the Canadian Cancer Society Friday, July 8 from 9 a.m. to 9 p.m. at the West Vancouver Tennis Club. He started the event when he was in Grade 8 and has to date raised $9,500 for the society. To donate, visit convio.cancer.ca/goto/TennisaThon2016. To participate, sign up at the tennis club until July 7.