Last Friday, Tyson Gay showed that despite previous evidence to the contrary, Usain Bolt was not actually invincible. The American scored a rousing upset of the world's fastest man at a meet in Stockholm, Bolt's first loss in the event since 2008. On Tuesday, Bolt's air of invincibility took another hit.

The world record holder in the 100 and 200 will call it quits for the rest of 2010 because of tightness in his lower back. His spokesman says that the condition affects Bolt's ability to generate power in his stride and could lead to leg injuries down the road. Following some treatment to loosen his back, Bolt will rest for the rest of the season before starting preparations next year for the world championships.

From the sounds of it, this is a precautionary measure and shouldn't be of concern for track fans. If it was worlds that were two weeks away instead of a meet in Zurich, it's doubtful Bolt and his people would have made the decision to shut down. It's convenient timing and

The 2012 Olympics are still two years away, but one athlete has already punched his ticket to London.

Last week, Italian shooter Niccolo Campriani became the first person to qualify for the upcoming Olympics after winning the 10m air rifle final at the ISSF World Championships in Munich. He defeated the current world-record holder and defending Olympic gold medalist to win the automatic berth.

The 22-year-old participated in the same event in Beijing, finishing 12th overall. He also came in 39th in the 50m rifle prone competition.

"I can't believe I am the first qualified athlete," he said in the Telegraph UK. "This is going to help me, the sport and our federation, in the future. I am so happy."

Campriani is an engineering student at West Virginia University.

In the days following Campriani's victory, other athletes have qualified for the Games in different shooting events. Slovakia's Zuzana Stefecekova was the first woman to earn a berth to the Games after winning the trap event at

The rivalry was supposed to begin at the Beijing Olympics two years ago. Instead, it kicked into high gear Friday evening in Stockholm.

In their first meeting since last year's world championships, American Tyson Gay stunned world record holder Usain Bolt in the 100-meter dash at the DN Galan meet in the Swedish capital. (Watch the clip here on Universal Sports.) It's the first major victory for Gay over Bolt in the event since the Jamaican shook the track world by setting a world record in May of 2008 and the first loss overall for Bolt in two years.

The final margin was almost as surprising as the order of finish: Gay crossed the tape in a 9.84 compared to a 9.97 for the three-time Olympic gold medalist. The American took advantage of Bolt's slowness out of the blocks in taking an early lead and then held him off down the stretch for an easy victory.

[Related: Usain Bolt adopts cheetah, names it 'Lightning']

Before we get too excited about this and start making analogies to

Only Michael Phelps could proclaim he was "terrible" on a night in which he won two national championships and broke the all-time record for most national titles in a career.

The 14-time gold medalist won the 200 freestyle and 200 butterfly, his 48th and 49th national titles, on Wednesday night at the U.S. swimming championships, but said he "felt absolutely awful" in the water. "I'm going to have to be in a lot better shape," he said. "I know what I need to do to change."

It was the first major meet for Phelps since the 2009 world championships and his rustiness showed. His won the 200 butterfly in 1:56.00, nearly 4 1/2 seconds slower than the world record he set last year in Rome. It was an uncharacteristically sloppy race for Phelps, who jammed his second turn and was late getting off the starting blocks. The time was still good enough to outpace the second-place finisher by over one second, but that seemed irrelevant to the most decorated swimmer ever.

"The bottom line is that I'm

To celebrate the beginning of the two-year countdown to the 2012 Olympics, stadium construction workers formed a giant "2" on a bridge near the still-uncompleted Aquatic Centre. The home to swimming, diving and water polo is in the foreground while Olympic Stadium (which will host the Opening and Closing Ceremony, and track and field events) is at right.

A ground shot of the Aquatic Centre, which will be the first stadium visible to fans entering Olympic Park. The pool will be indoors and will seat 17,500 for the Games.

The interior of Olympic Stadium, with the distinct, triangular light towers lining the stadium. Construction is expected to be completed next year, in time for London to host test events prior to the Opening Ceremony on July 27, 2012.

One of the biggest stars to emerge from the 2008 Olympics wasn't an athlete or coach, but a spectator sitting in the stands. Michael Phelps' mother, Debbie, was a fixture at his races and a favorite of NBC television cameras during her son's historic run to eight gold medals. Her reaction when Michael out-touched Milorad Cavic by .01 seconds in the 100 butterfly became of the indelible images of Beijing.

Debbie was in London on Wednesday as part of the announcement that Proctor & Gamble has signed a five-Olympic partnership deal with the IOC. She took some time from her busy schedule to talk on the phone with Fourth-Place Medal about the memories of Beijing, the anticipation of London, raising an Olympian and what makes her most proud as a mother.

Fourth-Place Medal: We just past the halfway point between Beijing and London. Have you started looking ahead to 2012 or are still reveling in the excitement of 2008?

Debbie Phelps: I'll never forget 2008. It was just an amazing time for the

The Court of Arbitration for Sport ruled in favor of Marion Jones teammates from the Sydney Olympics, giving them back the gold medals that were stripped after she admitted that she used performance-enhancing drugs during their wins.

Jearl Miles-Clark, Monique Hennagan, LaTasha Colander Clark and Andrea Anderson will get their 4x400 relay gold medals, while Chryste Gaines, Torri Edwards and Passion Richardson will get bronze for the 4x100.

According to the CAS, the International Olympic Committee's rules in 2000 did not require teammates' medals to be stripped when one athlete was found guilty of doping.

Marion Jones went from Olympic darling, winning five medals in 2000, to jailbird by 2008, after she was convicted of perjury in the BALCO steroid case. This winning-losing-winning medals streak puts a weird ending on a sad chapter of U.S. track and field history

Michael Phelps said he was "furious" with himself over the weekend after a lackluster performance at a swim meet in Paris in which he twice lost to a French teenager and finished last in the 100 freestyle.

The 14-time gold medalist won two of his four events at the Paris Open, but his struggles in the 100 and 200 freestyles left him concerned with the state of his training two years out from his probable Olympic swan song in London. From AP:

"Hopefully, it's a wake-up call. If it's not, then I have to change a lot. I blame myself. You've got to be responsible for your own action.

"I know what I have to work at to improve. I thought I had done better training (after his first meet of the year in May) but clearly I have not. I'm the only one who can fix it."

Yannick Agnel, 18, beat Phelps in both freestyle events, setting a French national record in winning the 200. He said he was thrilled to beat the most decorated swimmer of all time, but realizes that Phelps wasn't in the best