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.
Sam Querrey Sam Austin Querrey ( ; born October 7, 1987) is an American professional tennis player who is currently ranked world No. 16 in men's singles by the Association of Tennis Professionals (ATP). Known for his powerful serve, Querrey holds the record for consecutive service aces: 10. He is also a capable doubles player, with five doubles titles and a career-high doubles ranking of world no. 23.