Notes: Calm Davydenko not upset about investigation question

"On my sofa, watching on TV," Muller said. "Now I'm here, and I'm in it."

Muller has played mostly on the lower-level challenger circuit this year, but he's no newcomer to big upsets at majors. In 2005, he beat Rafael Nadal in the second round at Wimbledon and Andy Roddick in the first round at the U.S. Open when each was ranked third.

Now Muller will probably climb into the top 65 in the rankings and is guaranteed at least $160,000 in prize money. He'd made just $74,851 this year.

So American football will have to wait.

"We don't follow it so much in Luxembourg, but I really like it, yeah," Muller said. "I went to a (Dolphins) game last year for the first time in Miami when I was practicing there.

"It was the only game they won."

Who's No. 1?

Winning the U.S. Open would make Elena Dementieva the top-ranked woman in the world. Even so, she's not sure who's really the best right now.

"There is no No. 1 for the moment," the fifth-seeded Russian said Tuesday after coasting past Patty Schnyder 6-2, 6-3. "Because, well, I don't know. Maybe the competition is too tough. It's quite open for a few players."

Serena Williams, Jelena Jankovic and Dinara Safina could wind up as No. 1, as could top-seeded Ana Ivanovic despite her early upset loss at Flushing Meadows.

"I think probably the most consistent player is Jelena Jankovic," Dementieva said.

Dementieva won the Olympic gold medal and is trying to win her first Grand Slam championship. She has won all 10 sets she's played in this tournament.

"I feel I need to improve my game," she said. "I really feel that there are some players out there that are very powerful. I need to be a stronger player. I need to improve my serve."

In the picture

Sam Querrey's surprising run in the U.S. Open gave him another kind of shot at success.

The 55th-ranked Querrey reached an endorsement deal with Olympus on Tuesday, a day after he lost to No. 1 Rafael Nadal in a tough fourth-round match.

The 20-year-old Querrey and fellow young American John Isner are the only pro tennis players to sign deals with the camera company.