This article details the list of men's singles Grand Slam tournaments tennis champions. (Winners of all four Grand Slam singles tournaments in the same calendar year) . Concord Encyclopedia; Jump up ^ CBS Sports ""; Jump up ^ Top End Sports ""; Jump up ^ USA Today Tennis ""; Jump up ^ Tennis 28 Slams "" Grand Slam · Rod Laver · Roy Emerson · Lists of tennis records and. Who has won the most Tennis Grand Slam Titles in history of Open Era of top 15 grand slam winners in both women and mens category. During a fantastic era for American men's tennis - which was dominated by Andre Agassi and Pete Sampras - Martin's grand slam drought is one filled with.