MONTREAL (AP) -- Qualifier Robin Haase upset 10th-seeded Tomas Berdych 6-4, 7-5 Monday in the rain-delayed first round of the Rogers Masters.
Lleyton Hewitt beat Juan Carlos Ferrero 7-6 (5), 6-4 in a matchup of former top-ranked players. Ferrero is ranked 17th in the world and Hewitt is 21st.
"My main focus is on the US Open, more than the ranking situation,'' Hewitt said. "I feel like I'm a lot better player than where my ranking is sitting at. I'd like to say I'm a dangerous floater now.''
The 2001 US Open champion and 2002 Wimbledon winner won his 26th career title this year at Las Vegas, but has not played in nearly two months while recovering from a back injury.
Haase, ranked 103rd, broke serve for a 6-5 lead in the second set and served out the match for his first career win against a top-10 opponent. He'll next face Marcos Baghdatis or Carlos Moya.
"To beat a player with the name Berdych is unbelievable,'' Haase said. "It's my best win, for sure. Last week in Washington, I could have won against (Russian) Marat Safin, too. I had chances, so I knew I could bring up my level.''
Berdych reached the quarterfinals at last year's Rogers Cup, where he upset Rafael Nadal.
In a night match, Canada's Frank Dancevic used precision serving to defeat towering teenager Juan Martin Del Potro 6-4, 3-6, 6-3.
The Ontario native advanced to play American qualifier Wayne Odesnik, who upset 11th seeded Ivan Ljubicic of Croatia 6-3, 4-6, 7-6 (5). Dancevic, ranked 91st, beat Del Potro and Andy Roddick en route to his first ATP tournament final two weeks ago in Indianapolis.
Before a thin, but encouraging crowd in a late-night match at Uniprix Stadium, Dancevic gave up only four points on his serve while taking the opening set against the 6-foot-6 Del Potro -- the youngest player in the tournament at 18.
Del Potro served out the second set, but Dancevic broke for a 3-1 lead in the third and didn't look back, finishing the match with an ace.
It ended after midnight because Paul-Henri Mathieu needed 2 hours, 12 minutes in the first evening match to rally for a 4-6, 7-5, 6-0 win over 15th-seeded Guillermo Canas, the 2002 tournament champion. Canas had leads of 3-0 and 4-1 in the second set, then fell apart as the Frenchman stepped up his game.
In other matches, Argentina's David Nalbandian ousted Alejandro Falla of Colombia 6-4, 6-3 and next will face 16th-seeded David Ferrer of Spain, who beat Ernests Gulbis of Latvia 6-2, 6-1.
Stanislas Wawrinka of Switzerland downed Lee Hyung-Taik of South Korea 6-3, 3-6, 6-3.