MARSEILLE, France – Halfway through the Tour de France, no compelling newcomer has broken through, no favorite has emerged and doping allegations have surfaced yet again. Cedric Vasseur became the first French rider to win a stage this year, but his victory and the Tour were overshadowed by the announcement of the doping test on cyclist Patrik Sinkewitz during a training session last month that turned up high levels of testosterone.

The announcement of the case by Germany’s cycling federation of the T-Mobile team member, who crashed into a spectator on Sunday and withdrew from the Tour, returned the cloud of doping on a race that had reached its midpoint Wednesday.

The results of Sinkewitz’s “A” sample, announced in Germany shortly before the stage began, quickly spread through the field on Wednesday.

Vasseur handled that field as he narrowly outsprinted four other cyclists in a breakaway group during the 142.6-mile 10th stage from Tallard to Marseille under a searing sun to cross in 5 hours, 20 minutes, 24 seconds. It was his first win at cycling’s biggest race since 1997.

Michael Rasmussen retained the overall leader’s yellow jersey, finishing safely in 30th place among his top rivals. The Dane is two minutes, 35 seconds ahead of second-placed Alejandro Valverde of Spain, and 2:39 in front of fellow Spaniard Iban Mayo in third.

Wednesday’s stage didn’t alter the standings among the remaining contenders, many of whom were recovering from three rides in the Alps. Two time trials and three stages in the Pyrenees await before the July 29 finish on the Champs-Elysees in Paris.

The T-Mobile team, which has enacted some of the toughest anti-doping measures in the sport in response to doping controversies, has been trying to rebuild among young riders. Sinkewitz is 26.

T-Mobile temporarily suspended Sinkewitz.

He has five days to decide whether to request a B sample test. If that also comes back positive, he faces a possible ban. He also would be fired by his team and have to pay back his annual salary.

“The entire team was stunned,” T-Mobile sporting manager Bob Stapleton said. “It was quite a shock to everybody, but … they’re fighters, they came here to compete.”

While the results took two weeks to come to light, Sinkewitz and four teammates were tested June 8 during a training run in the Pyrenees mountains _ where the race heads next week.

“It’s not possible. I know nothing about it,” Sinkewitz told the German news agency DPA. “I am about to have surgery. I can’t deal with it now.”

T-Mobile said Sinkewitz was undergoing surgery on his jaw at a Hamburg, Germany clinic, a consequence of Sunday’s crash. The revelation was a blow for T-Mobile.

Jan Ullrich, a former team leader who won the Tour in 1997, retired this year after he was mentioned in the Spanish anti-doping probe known as Operation Puerto.

Two German public television stations that had been broadcasting the Tour responded by saying they were dropping their coverage “until further notice.”

Patrice Clerc, the president of Tour organizer Amaury Sports Organisation, expressed “stupefaction” at the revelations and called it “paradoxical” that the German broadcasters had halted their coverage.

He said riders “are playing Russian roulette, in a way, when they are tempted to cheat.”

The next major change among the leaders is likely to come in Saturday’s 13th stage _ a 33.6-mile time trial in Albi. Rasmussen has admitted he’s not strong in such races against the clock.

Thursday’s 11th stage favors sprinters, taking the peloton along a mostly flat, 113.4-mile ride along the Mediterranean from Marseille to Montpellier.

Among the remaining contenders, Cadel Evans of Australia is fourth, 2:41 back; Frenchman Christophe Moreau is sixth, 3:18 behind; Carlos Sastre of Spain trails by 3:39 in seventh, and American Levi Leipheimer is ninth, 3:53 off the pace.

Germany’s Andreas Kloeden, one of the world’s best long time-trial specialists who was runner-up to Lance Armstrong in 2004, is 3:50 back, and his Astana teammate Alexandre Vinokourov is 8:05 behind.

The main favorites finished in a pack that finished 10:36 behind Vasseur, whom they gladly let race ahead because he is still 36:05 back in the overall standings.

Vasseur, who turns 37 in August, says this year will be his last in the sport.

“I think I can leave cycling with my head held high,” he said. “I am happy to offer France the first win on the Tour.”

AP Sports Writers Jerome Pugmire in Marseille and Nesha Starcevic in Frankfurt, Germany, contributed to this report.

A service of the Associated Press(AP)