Neither Matt Green nor Kirsten Black is used to running 10K races. But at the Women's Center Tysons 5K-10K Championchip in Vienna yesterday, Green, a former Maryland cross-country runner, easily won the men's 10K portion and Black ran away with the women's race.

Green won in 34 minutes and 58 seconds, ahead of Matt Cooke, who finished second in 36:05.

Black, a former track and field runner at Duke and current triathlete, won the women's 10K race in 39:06. Heidi Sickler finished second in 43:39.

More than 900 runners participated on the hilly course near Tysons Corner shopping center.

Green, 22, took the lead for good at the fourth mile yesterday, when he passed then-leader Cooke. He said he is adjusting to running longer road races after running 8K (five mile) races as a member of the Terrapins' cross-country team.

"In high school, we ran 5K [3.1-mile] races, then in college it went up to 8K, so I guess it is time for me to step it up again," Green said.

Black, 24, led from the outset of the women's race. In the World Triathlon Championships in Montreal two weeks ago, she was the fifth finisher in the 20- to 24-year-old age group.

"I had taken some time off after the triathlon championships, but I wanted to come out today because this is for a good cause," Black said. "I do not do many road races in the summer, since that is when I do triathlons. But in the fall and spring I always look forward to doing the road races."