Top-seeded Rafael Nadal was upset by Joachim Johansson 6-4, 7-6 (4) Wednesday at the Stockholm Open while Frank Dancevic of Niagara Falls, Ont., lost his second-round match.

Johansson, ranked 690th, played in his first ATP event since February after being sidelined for months because of right shoulder and elbow injuries.

Johansson aced Nadal four times in the opening game and broke to lead 2-1. The Swede saved a break point at 5-4 before clinching on his third set point.

In the second set, both players held serve until the tiebreaker. Johansson took a 5-4 lead and another ace, his 17th in the match, gave him two match points.

Dancevic lost 3-6, 6-3, 6-4 to seventh-seeded Belgian Kristof Vliegen.

Earlier, defending champion James Blake of the U.S., downed Thomas Johansson of Sweden 6-3, 6-2.

Blake is in sixth place in the ATP race leading to next month's season-ending Tennis Masters Cup in China, where the top eight players qualify.

Blake is coming off his fourth ATP tour title of the year in Bangkok two weeks ago. Only top-ranked Roger Federer (nine) and Nadal (five) have won more titles this year.

Blake expected a tougher match against the former Australian Open champion.

``I thought it would be tricky,'' Blake said. ``I didn't want to have a letdown and I thought about it ... but once I got rolling and a break early I got the confidence pretty quickly.''

Thomas Johansson, the 2002 Australian Open champion, is 6-15 this year. Half his wins came at the Australian Open, where he reached the fourth round.

Other seeded players to advance were: No. 5 Jarkko Nieminen of Finland, No. 6 Olivier Rochus of Belgium and No. 8 Robin Soderling of Sweden.

Rochus advanced to the quarter-finals after beating Paradorn Srichaphan of Thailand 6-2, 6-7 (5), 6-2. Rochus led 6-3, 5-3, but Paradorn got back into the match before the Belgian took command in the third. Paradorn won the Stockholm Open in 2002.

Soderling reached the quarter-finals after routing Jonas Bjorkman 6-0, 6-2.

Nieminen topped Michael Llodra of France 6-4, 6-4, and Simon Greul of Germany beat Swedish wild card Ervin Eleskovic 6-4, 6-2, in the first round.

© The Canadian Press, 2007