Great Britain's Mo Farah talks to reporters on Friday, June 1, 2012, the day before the Prefontaine Classic athletics meet in Eugene, Ore. (AP Photo/Ted S. Warren)

Great Britain's Mo Farah plays table tennis on Friday, June 1, 2012, at a hotel in Eugene, Ore., following a news conference the day before the Prefontaine Classic athletics meet. Farah was playing against Nike shoe developer Chris Cook. (AP Photo/Ted S. Warren)

Great Britain's Mo Farah wears a beaded bracelet with a British flag design as he talks to reporters on Friday, June 1, 2012, the day before the Prefontaine Classic athletics meet in Eugene, Ore. (AP Photo/Ted S. Warren)

Great Britain's Mo Farah, left, sits with United States' Sanya Richards-Ross, center, and USA's Bernard Lagat, right, as they talk to reporters on Friday, June 1, 2012, the day before the Prefontaine Classic athletics meet in Eugene, Ore. (AP Photo/Ted S. Warren)

Great Britain's Mo Farah, left, poses for a photo with fan Sean Duffy, 19, of Johnson City, Tenn., following a news conference on Friday, June 1, 2012, the day before the Prefontaine Classic athletics meet in Eugene, Ore. (AP Photo/Ted S. Warren)

Great Britain's Mo Farah talks to reporters on Friday, June 1, 2012, the day before the Prefontaine Classic athletics meet in Eugene, Ore. (AP Photo/Ted S. Warren)

Kenya's Asbel Kiprop listens to a question from a reporter on Friday, June 1, 2012, the day before the Prefontaine Classic athletics meet in Eugene, Ore. (AP Photo/Ted S. Warren)

Kenya's Asbel Kiprop listens to a question from a reporter on Friday, June 1, 2012, the day before the Prefontaine Classic athletics meet in Eugene, Ore. (AP Photo/Ted S. Warren)

Kenya's Asbel Kiprop listens to a question from a reporter on Friday, June 1, 2012, the day before the Prefontaine Classic athletics meet in Eugene, Ore. (AP Photo/Ted S. Warren)

Kenenisa Bekele, of Ethiopia, waits for a news conference to begin on Friday, June 1, 2012, the day before the Prefontaine Classic athletics meet in Eugene, Ore. (AP Photo/Ted S. Warren)

Kenenisa Bekele, of Ethiopia, talks to reporters during a news conference on Friday, June 1, 2012, the day before the Prefontaine Classic athletics meet in Eugene, Ore. (AP Photo/Ted S. Warren)

United States' Allyson Felix, center, talks to reporters on Friday, June 1, 2012, the day before the Prefontaine Classic athletics meet in Eugene, Ore. (AP Photo/Ted S. Warren)

United States' Sanya Richards-Ross talks to reporters on Friday, June 1, 2012, the day before the Prefontaine Classic athletics meet in Eugene, Ore. (AP Photo/Ted S. Warren)

Great Britain's Mo Farah talks to reporters on Friday, June 1, 2012, the day before the Prefontaine Classic athletics meet in Eugene, Ore. (AP Photo/Ted S. Warren)

United States' Allyson Felix talks to reporters on Friday, June 1, 2012, the day before the Prefontaine Classic athletics meet in Eugene, Ore. (AP Photo/Ted S. Warren)

United States' Ashton Eaton talks to reporters on Friday, June 1, 2012, the day before the Prefontaine Classic athletics meet in Eugene, Ore. (AP Photo/Ted S. Warren)

United States' Bernard Lagat talks to reporters on Friday, June 1, 2012, the day before the Prefontaine Classic athletics meet in Eugene, Ore. (AP Photo/Ted S. Warren)

United States' Ashton Eaton talks to reporters on Friday, June 1, 2012, the day before the Prefontaine Classic athletics meet in Eugene, Ore. (AP Photo/Ted S. Warren)

Great Britain's Mo Farah is displayed in a video camera monitoring screen as he talks to reporters on Friday, June 1, 2012, the day before the Prefontaine Classic athletics meet in Eugene, Ore. (AP Photo/Ted S. Warren)

Kirani James, of Grenada, talks to reporters on Friday, June 1, 2012, the day before the Prefontaine Classic athletics meet in Eugene, Ore. (AP Photo/Ted S. Warren)

Kathrin Klaas, of Germany, falls during the hammer throw, Friday, June 1, 2012, in the Prefontaine Classic athletics meet, in Eugene, Ore. Klaas withdrew from the event. (AP Photo/Ted S. Warren)

Kathrin Klaas, of Germany, gets her feet tangled during the hammer throw, Friday, June 1, 2012, in the Prefontaine Classic athletics meet, in Eugene, Ore. Klaas fell to the ground on the attempt and withdrew from the event. (AP Photo/Ted S. Warren)

United States' Jessica Cosby throws the hammer for a new U.S. record, Friday, June 1, 2012, in the Prefontaine Classic athletics meet, in Eugene, Ore. (AP Photo/Ted S. Warren)

Wilson Kiprop, left, edges out Moses Ndiema Masai, right, Friday, June 1, 2012, to win the Kenyan Olympic Trials 10K in the Prefontaine Classic athletics meet, in Eugene, Ore. (AP Photo/Ted S. Warren)

Wilson Kiprop celebrates with the Kenyan flag, Friday, June 1, 2012, after he won the Kenyan Olympic Trials 10K in the Prefontaine Classic athletics meet, in Eugene, Ore. (AP Photo/Ted S. Warren)

Wilson Kiprop, left, edges out Moses Ndiema Masai, right, Friday, June 1, 2012, to win the Kenyan Olympic Trials 10K in the Prefontaine Classic athletics meet, in Eugene, Ore. (AP Photo/Ted S. Warren)

Kenya's James Kiplagat Magut wins the International Mile, Friday, June 1, 2012, in the Prefontaine Classic athletics meet, in Eugene, Ore. (AP Photo/Ted S. Warren)

USA's Alice Schmidt wins the 1500m Women's National, Friday, June 1, 2012, in the Prefontaine Classic athletics meet, in Eugene, Ore. At left is USA's Jenny Simpson, who finished second. (AP Photo/Ted S. Warren)

Competitors in the Kenyan 10K Olympic trial run in the rain Friday, June 1, 2012, in the Prefontaine Classic athletics meet, in Eugene, Ore. (AP Photo/Ted S. Warren)

Ethiopians Tirunesh Dibaba, center, Werknesh Kidane, left, and Beleynesh Oljira, right, take a victory lap with the Ethiopian flag after Dibaba won the 10,000m event Friday, June 1, 2012, in the Prefontaine Classic athletics meet, in Eugene, Ore. Oljira finshed third, and Kidane finished fourth. (AP Photo/Ted S. Warren)

From left, Caroline Nyakogwa, of Kenya, Tirunesh Dibaba, of Ethiopia, and Werknesh Kidane, right, of Ethiopia, run the 10,000-meter event, Friday, June 1, 2012, in the Prefontaine Classic athletics meet, in Eugene, Ore. (AP Photo/Ted S. Warren)

Germany's Betty Heidler competes in the hammer throw, Friday, June 1, 2012, in the Prefontaine Classic athletics meet, in Eugene, Ore. Heidler won the event. (AP Photo/Ted S. Warren)

Germany's Betty Heidler competes in the hammer throw, Friday, June 1, 2012, in the Prefontaine Classic athletics meet, in Eugene, Ore. Heidler won the event. (AP Photo/Ted S. Warren)

USA's Alysia Montano wins the 800-meter event, Friday, June 1, 2012, in the Prefontaine Classic athletics meet, in Eugene, Ore. (AP Photo/Ted S. Warren)

USA's Christian Taylor lands a triple jump, Friday, June 1, 2012, in the Prefontaine Classic athletics meet, in Eugene, Ore. Taylor won the event. (AP Photo/Ted S. Warren)

Tirunesh Dibaba, of Ethiopia, right, smiles as Beleynesh Oljira, also of Ethiopia, goes down to rest behind her after Dibaba won the 10,000-meter event, Friday, June 1, 2012, in the Prefontaine Classic athletics meet, in Eugene, Ore. Oljira finished third. (AP Photo/Ted S. Warren)

Wilson Kiprop greets fans as he takes a victory lap with the Kenyan flag, Friday, June 1, 2012, after he won the Kenyan Olympic Trials 10K in the Prefontaine Classic athletics meet, in Eugene, Ore. (AP Photo/Ted S. Warren)

Sandra Perkovic, of Croatia, competes in the discus event, Friday, June 1, 2012, in the Prefontaine Classic athletics meet, in Eugene, Ore. Perkovic won the event.(AP Photo/Ted S. Warren)