premise: Jamie Murray is a three-time Grand Slam doubles loser.
hypothesis: Jamie Murray . He is a three-time Grand Slam doubles winner and a Davis Cup champion , currently the world No. 5 doubles player , and a former doubles world No. 1 . He has won three Grand Slam titles : the mixed doubles title at the 2007 Wimbledon Championships with Jelena Janković and the men 's doubles titles at the 2016 Australian Open and 2016 US Open with Bruno Soares .