#4 Sebastien Lareau
The first ever Canadian tennis athlete to win a Grand Slam title across any category was Sebastien Lareau. He achieved this feat at the 1999 US Open, with his American partner Alex O' Brien. The pair defeated the Indian duo of Leander Paes and Mahesh Bhupathi in the final.
Lareau reached a career-high doubles ranking of World Number 4 in October 1999 following his US Open triumph. The same year he won the ATP Finals tournament, again with O' Brien.
Lareau continued his good form going into the 2000 tennis season, grabbing the gold medal at the Sydney Olympic Games with compatriot Daniel Nestor. Remarkably, they beat home favorites and top seeds Mark Woodforde and Todd Woodbridge in the final.
Lareau won a total of 17 ATP doubles titles, including four ATP Masters Series titles, in his career.