Allgaier, the 2009 rookie of the year in the series, passed Keselowski after a restart with 27 laps remaining. He then held off several challenges by his teammate in the final laps to record his first win in his 43rd start.

Kyle Busch finished third, while Carl Edwards and Kevin Harvick rounded out the top-five.

Keselowski edged Joey Logano for the top starting position with a lap of 124.557 m.p.h. for his second pole of the season and the fifth of his Nationwide career. He also won the pole at Bristol last August.

Logano qualified 0.1 seconds behind Keselowski to capture the outside pole.

Logano, the 2009 Sprint Cup rookie of the year, posted a lap of 124.630 m.p.h. on the half-mile, high-banked track to record his first pole in his 44th start.

The 19-year-old is having a remarkable sophomore season so far in NASCAR's top circuit, as he currently sits 14th in points.

NASCAR officials made the announcement Tuesday at Charlotte Motor Speedway, where the all-star event will be held on May 22.

Starting this year, all drivers must pit for four tires once the field completes one lap behind the pace car prior to the start of the fourth segment.

Following a two-week break, the Nationwide Series returns to action with their first short-track race of the season at Bristol.

Carl Edwards heads to Bristol with a 41-point lead over Brad Keselowski. Saturday's Nationwide race will be the first time Edwards and Keselowski compete against each other since their confrontation in last week's Sprint Cup race at Atlanta.

After taking the first off-weekend of the season, the Sprint Cup Series will return to Bristol, and all eyes will be focused on Carl Edwards and Brad Keselowski.

Edwards begins his three-race probation period at Bristol. The Roush Fenway Racing driver avoided suspension after he deliberately hit Keselowski from behind and sent him flying upside down into the frontstretch wall last week at Atlanta.

While no announcement has been made yet, NASCAR is expected to replace the rear wing with the spoiler on the Car of Tomorrow (COT) prior to the April 25 Aaron's 499 at Talladega.

The wing has been a fixture of the COT since its debut three years ago at Bristol, where the series runs later this week. Teams have raised concerns about the wing, since it has reduced downforce on the cars. The spoiler was used on the previous cars.

NASCAR Sprint Cup Series Food City 500 - Bristol Motor Speedway - Bristol, TN After taking the first off-weekend of the season, the Sprint Cup Series will return to Bristol, and all eyes will be focused on Carl Edwards and Brad Keselowski.

Edwards begins his three-race probation period at Bristol. The Roush Fenway Racing driver avoided suspension after he deliberately hit Keselowski from behind and sent him flying upside down into the frontstretch wall last week at Atlanta.

Power turned in a gutsy performance in the series' season-opener and first race held in a South American country. The 29-year-old Aussie avoided a five- car pileup on the opening lap and then endured rainy conditions for a majority of the event before passing Ryan Hunter-Reay for the lead in the closing minutes to claim his second career IndyCar victory.

"It was probably the most mixed up race that I have ever been in, but it created an opportunity for me to come back through the field and end up winning the race," Power said. "I think it was just a really good day for racing. If you were fast you could pass, because there is such a good track layout here. I'm pretty sure it was an exciting race for the

Power and Hunter-Reay battled for the lead before the Aussie took the top position for good with three-and-a-half minutes remaining. The inaugural race in Brazil was scheduled for 75 laps, but Indy Racing League officials placed a time limit on the event due to numerous accidents and a brief delay for a thunderstorm.

The 29-year-old driver made his first start since he was seriously injured in a practice crash last August at Sonoma, Ca. He claimed his second career IndyCar victory. His first win came during the 2009 season in Edmonton, Canada.

Alonso, a two-time F1 champion, benefited from Sebastian Vettel's late-race mishap.

Vettel started on the pole and led two-thirds of the 49-lap race, but the Red Bull driver lost power, allowing Alonso to sweep by and take the lead for good.

One day after qualifying was delayed due to poor track conditions, Franchitti lapped the 2.6-mile, 11-turn street circuit in one minute, 27.7354 seconds. Qualifying took place on the same day as the race -- a first for the series.

"I was a little surprised to get into (the Firestone Fast Six)," Franchitti said. "I didn't have a very good day yesterday. We struggled to get my car the way I wanted it to work." IRLofficials postponed Saturday's scheduled qualifying after slippery concrete and very bumpy conditions along the front straightaway portion of the track presented safety concerns.

Officials made the decision after receiving driver feedback relating to the slippery concrete along the front straightaway portion of the track. Drivers also complained of very bumpy conditions in the same section of the 2.6-mile, 11-turn street circuit.

Part of the straight rests on an area referred to as the Anbembi Sambodromo, whichis one-third of a mile in length.

Vettel, who finished second to champion Jenson Button in 2009, lapped the 3.914-mile, 23-turn Bahrain circuit during the closing 10-minute qualifying session in one minute, 54.101 seconds for his sixth career F1 pole. The young German won two of the final three grand prix last year.

"I am very happy to be on pole thanks to the team," Vettel said. "To come here the first time that everyone really shows how strong they are and to be on top is a very nice feeling." Vettel finished 0.141 seconds quicker than Massa, who will start on the outside pole.

It's anyone's guess right now who the favorite is to win this year's F1 world championship, as several drivers, particularly reigning titleholder Jenson Button, have new rides. The grid has increased with three new teams added and new rules are in place to make this one of the most competitive seasons in the sports' 61-year history.

THE SEVEN-TIME CHAMPION RETURNS Schumacher announced in December he was ending his three-year retirement in F1, as he joined the newly formed Mercedes GP. Mercedez-Benz recently acquired Brawn GP, which captured the constructors' title and drivers' championship with Button during the team's maiden season in 2009. Last August,

WILL GANASSI'S REIGN CONTINUE? Dario Franchitti capped off his return to IndyCar in 2009 with his second championship. Franchitti edged 2008 series champion and Target Chip Ganassi Racing teammate Scott Dixon by 11 points.

After winning his first title with Michael Andretti's team in 2007, Franchitti joined Ganassi and moved over to NASCAR Sprint Cup and Nationwide Series competition the following year, but his efforts in stock car r

Amid the blistering desert heat, the 2010 Formula One season gets underway this weekend with the Bahrain Grand Prix. Three new teams -- Hispania Racing Team (HRT), Lotus Racing and Virgin Racing -- will make their debuts at Bahrain, but Michael Schumacher will be the center of attention as the seven- time F1 champion returns to the sport.

After three years of retirement, the 41-year-old German is making a comeback with the newly formed Mercedes GP team. Mercedes-Benz recently acquired Brawn GP, which captured the constructors' title and drivers' championship with Jenson Button in the team's maiden season last year.

The IndyCar Series -- with new title sponsor IZOD -- will compete in South America for the first time with the Sao Paulo Indy 300 on the streets of Sao Paulo, Brazil.

Dario Franchitti also will begin his campaign to repeat as series champion. Franchitti ended the 2009 season with an 11-point margin over his Chip Ganassi Racing teammate Scott Dixon. Four of his five wins last year came on road/street courses.

IZOD INDYCAR SERIES Sao Paulo Indy 300 - Streets of Sao Paulo - Sao Paulo, Brazil The IndyCar Series -- with new title sponsor IZOD -- will compete in South America for the first time with the Sao Paulo Indy 300 on the streets of Sao Paulo, Brazil.

Dario Franchitti also will begin his campaign to repeat as series champion. Franchitti ended the 2009 season with an 11-point margin over his Chip Ganassi Racing teammate Scott Dixon. Four of his five wins last year came on road/street courses.

According to a news release, William Keith, a crew member of the No.38 Front Row Motorsports/Yates Racing team in the Sprint Cup Series, and Matthew Huffstetler, a member of the No.01 Daisy Ramirez Motorsports team in the Camping World Truck Series, were found to have violated sections 12-1 (actions detrimental to stock car racing) and 19 (violation of the NASCAR substance abuse policy) of the 2010 NASCAR rule book.

NASCAR has suspended five crew members so far this season for violating its drug policy.

NASCAR President Mike Helton addressed the seriousness of the Edwards- Keselowski incident, in which Keselowski's car went flying upside down into the frontstretch wall after Edwards deliberately hit him from behind in the closing laps at Atlanta.

Helton also said NASCAR officials had several discussions internally as well as conversations with the stakeholders of the situation, including team owners Jack Roush (Edwards) and Roger Penske (Keselowski), before making their decision to place Edwards on probation for the upcoming races at Bristol, Martinsville and Phoenix.

Keselowski got his bell rung when Edwards intentionally bumped him from behind and sent his No.12 Penske Dodge flying upside down into the wall along the frontstretch at the fast 1.54-mile track.

Edwards was more than 150 laps behind at the time of the crash, due to a previous encounter with Keselowski earlier in the race. Keselowski clipped Edwards and shot him up to the track before he made contact with Joey Logano and then slammed into the wall.

Busch squeezed his way from fourth to first just after the first two-lap overtime restart. A seven-car pileup occurred just before the final lap when Jamie McMurray and Clint Bowyer made contact, forcing a second attempt to end the race. Busch held off Matt Kenseth and Juan Pablo Montoya in the final two laps for his third victory at Atlanta and the 21st of his career.

Kenseth finished second, followed by Montoya, Kasey Kahne, who led the most laps with 143, and Paul Menard.

Hornaday, the defending series champion, secured his 24th career pole with a lap of 177.721 m.p.h. He also won the pole at Atlanta in 2007 and '08.

Kyle Busch will start on the outside pole after posting a lap of 177.306 m.p.h. Busch is the defending race winner.

Earnhardt Jr.'s lap of 192.761 m.p.h. set a record for the fastest qualifying speed in the new Sprint Cup Series car -- the Car of Tomorrow. His Hendrick Motorsports teammate, Jimmie Johnson, held the record with a lap of 192.376 m.p.h. last October at Charlotte.

"It's really fast," Earnhardt Jr. said of his qualifying lap around the 1.54- mile track. "You just got to hang on. I think there's a lot of cars that can run that fast, but you just got to hang on to it." Earnhardt Jr.