Alex O'Brien and Jonas Björkman both reached what World ranking in doubles?
Alex O'Brien Alex O'Brien (born March 7, 1970 in Amarillo, Texas) is a retired professional tennis player from the United States, who competed on the ATP Tour. He became the world No. 1 doubles player in May 2000 and was ranked as high as world No. 30 in singles in June 1997.
Alex De Minaur Alex De Minaur (Spanish: "Álex de Miñaur" ; born 17 February 1999) is an Australian tennis player. He has a career-high ATP singles ranking of 184 achieved on 7 August 2017.