Ambrose will leave JTG Daugherty team

Marcos Ambrose is leaving JTG Daugherty Racing at the end of the season.

Team co-owner Tad Geschickter said Tuesday the organization is disappointed to see the Australian driver leave after five seasons. Ambrose started with the team in the Truck Series and helped it expand to NASCAR's premier Sprint Cup Series.

"After five years, I personally felt it was time for a change," Ambrose said.

Ambrose debuted with the team in a 2006 truck race at Martinsville, Va. He won two Nationwide Series races for JTG and nearly won the Cup race at Sonoma, Calif., last month. He lost the race when, while trying to conserve fuel under caution, he turned his engine off and couldn't maintain reasonable speed.

Ambrose did not say where he will drive next season, but he is believed to be close to finalizing a deal with Richard Petty Motorsports.

"I would like to continue in NASCAR and finish off what I started, but I have not discounted returning to Australia," Ambrose said. "I'm grateful to JTG Daugherty Racing for giving me an opportunity to become a NASCAR driver, and I wish them the best in the future."

JTG said it will make an announcement soon as to who will drive the No. 47 Toyota next season. Former North Carolina and NBA basketball star Brad Daugherty is a co-owner of the racing team.

Roush injured in plane crash: NASCAR team owner Jack Roush was in serious but stable condition after walking away from a plane crash in Wisconsin on Tuesday night.

"There are injuries. Possible surgery," Roush Fenway Racing president Geoff Smith said in a text message to The Associated Press. "But he walked out of the plane."

Smith confirmed that Roush was flying the plane. Smith said Roush's injuries include facial lacerations.

Roush, an aviation buff, was attending the Experimental Aircraft Association's annual AirVenture in Oshkosh, Wis., this week.

In a statement on the EAA Web site, officials said a Beechcraft Premier business jet registered to Roush Fenway Racing was involved in a landing accident at Wittman Regional Airport in Oshkosh at 6:15 p.m. CDT.

According to the EAA, the National Transportation Safety Board and Winnebago County Sheriff's Department confirmed that two occupants on board were Roush and Brenda Strickland of Plymouth, Mich.

"Each exited the aircraft following the accident," the statement said. "Both were transported to local hospitals, with Roush in serious but stable condition and Strickland with non-life threatening injuries. The NTSB is leading the investigation into the accident."

It is the second close call for Roush, who crashed a plane into a pond in Alabama in 2002 and was rescued by a former Marine who lived nearby.

Roush owns several aircraft, including a World War II-vintage P-51 Mustang.

McCombs backs F1 race: Former San Antonio Spurs and Minnesota Vikings owner Red McCombs is a key investor backing the new U.S. Grand Prix Formula One race to be run in Austin, Texas, beginning in 2012.

A wealthy car dealer, McCombs was introduced at a news conference to unveil the track site for the race that promoters have said will run in Austin for at least 10 years.

Formula One has said it will be the first track built in the U.S. specifically designed for a Grand Prix event.

Formula One hasn't raced in the United States since 2007 after an eight-year run at Indianapolis Motor Speedway.