John David Newcombe, AO, OBE (born 23 May 1944 in Sydney) is a former tennis player from Australia who won seven Grand Slam singles titles and an all-time record 17 doubles titles. He is one of the few men to have been ranked world No. 1 in both singles and doubles. He also contributed to five Davis Cup titles for Australia during an age when Davis Cup was deemed as significant as the Grand Slams. Tennis Magazine ranked Newcombe the 10th best male player of the period 1965–2005.