Patrick Galbraith and Rick Leach were the defending champions but they competed with different partners that year, Galbraith with Alex O'Brien and Leach with Jonas Björkman.
Jonas Björkman and Todd Woodbridge were the defending champions, but did not participate together this year.
 Björkman partnered Max Mirnyi, losing in the first round.
 Woodbridge retired from professional tennis earlier in the year.
Jonas Björkman and Todd Woodbridge were the defending champions but only Björkman competed that year with Jared Palmer.
The 2003 Canada Masters – Doubles was the men's doubles event of the one hundred and fourteenth edition of the Canada Masters; a WTA Tier I tournament and the most prestigious men's tennis tournament held in Canada.
 Bob Bryan and Mike Bryan were the defending champions but lost in the semifinals to Jonas Björkman and Todd Woodbridge.
 Mahesh Bhupathi and Max Mirnyi won in the final 6–3, 7–6 against Björkman and Woodbridge.
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.
Jonas Björkman and Jacco Eltingh were the defending champions, but Eltingh did not compete this year.
<br>Björkman teamed up with Patrick Rafter, and they won the title defeating the first-seeded Indian team of Mahesh Bhupathi and Leander Paes in the final, 6–3, 4–6, 6–4, 6–7, 6–4.
 This would be Rafter's only grand slam doubles title.
Jonas Björkman & Kevin Ullyett were the defending champions, but Björkman retired in 2008.
Mahesh Bhupathi and Jonas Björkman were the defending champions.
 Bhupathi did not participate this year.
 Björkman partnered Joachim Johansson.
Jonas Björkman and Kevin Ullyett were the defending champion, but Björkman was retired in November 2008.
Ullyett partnered up with Bruno Soares, and they won in the final 6–4, 7–6 against Simon Aspelin and Paul Hanley.
Jonas Lars Björkman (] ; born 23 March 1972, Alvesta, Sweden) is a former World No. 4 Swedish professional tennis player.
 He is also a former World No. 1 in doubles.
 Björkman retired from professional tennis after competing at the 2008 Tennis Masters Cup Doubles championships.

Question: Alex O'Brien and Jonas Björkman both reached what World ranking in doubles?
Answer: No. 1