MASON, Ohio -- Michael Chang upset Tommy Haas 6-3, 6-2 Tuesday in the Masters Series Cincinnati. Andy Roddick and top-seeded Lleyton Hewitt also advanced while Tim Henman beat defending champion Gustavo Kuerten.
Haas the third-seeded player, joined second-seeded Marat Safin, who lost Monday, on the sidelines. .
"I don't think I was mentally there," Haas said.
"I never got into a rhythm. It was tough to come back and focus, and Michael played very well. Even when he hit the frame, he was hitting the line. I was a little bit surprised with how well he moved forward and hit the ball."
Chang said he was relaxed throughout.
"I went out there and went for my shots, and most of them went in," he said.
Hewitt, the Wimbledon champion from Australia, beat No. 108 Robbie Ginepri of the United States 6-0, 6-0. Roddick, ranked ninth in the world and seeded 12th in the tournament, defeated Michel Kratochvil of Switzerland, 6-3, 6-3.
Henman, seeded fourth, knocked off Kuerten, 6-3, 6-4. The Brazilian won the Cincinnati tournament last year, beating Patrick Rafter in the finals.
Kuerten had slipped to No. 19 in the world after taking time off following hip surgery in February. The ailment forced Kuerten to retire last week from a first-round match in the Tennis Masters Series tournament in Toronto.
"It's tough to play the first round with a good leg," Kuerten said. "I'm still not at my best. I think I'm feeling about 70 or 80 percent. There's still some gap to get to my best. After he broke me in the first set, he started playing more aggressively. It seemed like I was always playing from behind."
Also Tuesday, 11th-seeded Sebastian Grosjean of France was upset by Dominik Hrbaty of Slovakia, 6-3, 3-6, 6-4.
Unseeded players advancing to the second round were Fernando Vincente of Spain, 6-4, 6-1 over Jeff Morrison of the United States; Wayne Arthurs of Australia, 6-3, 7-6 (3) over qualifier Noam Okun of Israel and Marcello Rios of Chile, 6-3, 6-2 over Gaston Gaudio of Argentina.
The Western & Southern Financial Group sponsors the tournament.