DES MOINES, Iowa — Brittney Reese didn't let a sore knee prevent her from matching her world-leading mark in the long jump.

The Mississippi junior, who at 5-foot-7 can dunk a basketball, soared 22 feet, 9 inches on her third jump under mostly clear conditions at Drake Stadium on Thursday to add an NCAA championship to her already impressive season.

The 21-year-old from Gulfport, Miss., matched the mark she had April 19 in Baton Rouge, La. Karin Mey of Russia also has gone 22-9 this year.

"This is really important for me because I broke my country's record today," he said. "It makes me feel really good going to the Olympics."

Reese has established herself as one of the long jump favorites for the U.S. Olympic trials that begin in two weeks in Eugene, Ore. She made the U.S. team at last year's world championships, making it to the finals and finishing eighth.

"I was trying to come out and do 23 feet, but I couldn't quite get it today," Reese said. "Hopefully I can get it at the Olympic trials."

She said she had heat treatment on her sore left knee before the competition, then iced it afterward. Reese didn't expect the soreness to hamper her performance at the trials.