Jeremy Wariner (Waco, Texas) and Allyson Felix (Santa Clarita, Calif.) will defend their world titles in the men's 400 meters and women's 200 meters, respectively, but they won't be alone. In the men's 400, Wariner is joined by 2000 Olympic gold medalist Angelo Taylor (Decatur, Ga.) and 2-time USA Outdoor runner-up LaShawn Merritt (Suffolk, Va.) as the Americans look for a sweep.

In the women's 200, a showdown between Felix, 2006 IAAF World Athlete of the Year Sanya Richards (Austin, Texas) and Olympic gold medalist Veronica Campbell of Jamaica is one of the most anticipated races of the meet. They will be joined by fellow Americans Torri Edwards (Corona, Calif.), the 2003 World Outdoor silver medalist in this event, and 2004 Olympian LaShaunte'a Moore (Akron, Ohio).

More American medal potential looms in the men's 110-meter hurdles, where two-time Olympic silver medalist Terrence Trammell (Ellenwood, Ga.) goes for his second World Outdoor medal. Appearing in his first World Outdoor final is David Payne, who is looking for a fairy tale ending to his Cinderella story.

In other competition, Bryan Clay (Glendora, Calif.) kicks off defense of his world decathlon title, with 2003 world champion Tom Pappas (Knoxville, Tenn.), Paul Terek (San Luis Obispo, Calif.) and Robert Arnold (Santa Rosa, Calif.) also competing. Teresa Vaill (Gainesville, Fla.) contests the women's 20 km final.

Semifinals are scheduled for the women's 1,500m and men's 800m, while qualifying is held in the men's javelin and men's 4x100m relay.

Below is a complete listing of USATF entrants for Friday competition.

Team USA entrants - Friday, August 31

8 a.m., women's 20 km race walk FINAL - Teresa Vaill (Gainesville, FL)

9:30 a.m., men's javelin qualifying - Breaux Greer (Scottsdale, AZ), Eric Brown (Fayetteville, AR)

10 a.m., decathlon 100m - Bryan Clay (Glendora, CA*, Tom Pappas (Knoxville, TN), Paul Terek (San Luis Obispo, CA), Robert Arnold (Santa Rosa, CA)

10:10 a.m., women's high jump qualifying - Amy Acuff (Isleton, CA), Erin Aldrich (Dallas, TX)

11 a.m., decathlon long jump

1 p.m., decathlon shot put

6:30 p.m., decathlon high jump

7:30 p.m., women's 1500m semifinal - Treniere Clement (Knoxville, Tenn.), Erin Donohue (Haddenfield, N.J.)

8:05 p.m., men's 800m semifinal - Nick Symmonds (Springfield, Ore.)

8:40 p.m., men's 4x100m relay first round

9:15 p.m., women's 200m FINAL - Allyson Felix (Santa Clarita, CA), Sanya Richards (Austin, TX), Torri Edwards (Corona, CA), LaShaunte'a Moore (Akron, OH)

9:35 p.m., decathlon 400m

10:05 p.m., men's 400m FINAL - Jeremy Wariner (Waco, Texas), Angelo Taylor (Decatur, Ga.), LaShawn Merritt (Suffolk, Va.)

10:20 p.m., men's 110m hurdles FINAL - Terrence Trammell (Ellenwood, GA), David Payne (Cincinnati, Ohio)