Leander Paes [ Images ] and Martin Damm [ Images ] of the Czech Republic upset the second seeded pair of Sweden's Jonas Bjorkman [ Images ] and Max Mirnyi [ Images ] of Belarus to enter the semi-finals of the ATP Masters Series event in Toronto, Canada [ Images ].

Paes and Damm, seeded seventh, won 7-6 (7/4) 7-5 in the quarter-finals on Friday.

They will next take on the third seeds Paul Hanley [ Images ] of Australia [ Images ] and Zimbabwean Kevin Ullyett, who defeated Australian Wayne Arthurs and Slovakia's Dominic Hrbaty in 6-4, 6-3 their quarter-final.

Top seeds Bryan brothers -- Bob and Mike -- will take on the fourth seeds Canadian Daniel Nestor [ Images ] and Mark Knowles [ Images ] of Bahamas in another semi-final.

The American siblings edged past the fifth seeded pairing of Frenchman Fabrice Santoro [ Images ] and Serbian Nenad Zimonjic in a marathon three-setter 3-6, 6-4, 10-7, while Knowles and Nestor defeated Sweden's Simon Aspelin and Australian Todd Perry 2-6, 6-3, 10-2.