Are John Austin and Marin Čilić are professional tennis players from different countries?
John Austin (tennis) John Austin (born July 31, 1957) is an American former professional tennis player born in Long Beach, California. He won the Wimbledon mixed doubles championship with his sister, Tracy Austin, in 1980, becoming the first brother and sister team to win a Grand Slam title together.
Michael Hill (tennis) Michael Robert Hill (born 30 June 1974) is a former tennis player from Australia who turned professional in 1997 and retired in 2005. He was primarily a doubles specialist, achieving a career-high doubles ranking of World Number 18, reached on 30 July 2001.