Representing the U.S.
Lance Brooks, Springfield, track and field (discus): The No. 1 discus thrower in the country, Brooks once worked seven jobs to pay for his training. The Millikin University graduate is ranked 34th in the world.
Kelci Bryant, Chatham, diving (3m synchro): After finishing fourth in Beijing, Bryant is looking to make the medal stand with partner Abby Johnston. The pair also finished fourth at the 2012 FINA World Cup.
Swin Cash, Chicago Sky, basketball: A gold medalist in Athens, Cash is trying to add to an impressive winning resume that includes two NCAA titles at Connecticut and three WNBA titles with Detroit and Seattle. Cash, traded to the Sky this year, badly wanted this honor after not making the 2008 team.
Tamika Catchings, Lincolnshire, basketball: The oldest member of the U.S. women's team at 33, the Indiana Fever star was Ms. Basketball of Illinois as a Stevenson High School sophomore in 1995 before moving to Texas.
Ellis Coleman, Oak Park, wrestling (60kg Greco-Roman): The youngest member of the U.S. wrestling team, Coleman, 20, became an Internet sensation last year when a video of him flipping his opponent — a move known as "The Flying Squirrel" — was posted on YouTube. A medal is a long shot, but he could garner some attention if he tries his acrobatic move in London.
Conor Dwyer, Winnetka, swimming (400 free, 800 free relay): The former Loyola Academy star made his first Olympic team last month by finishing second in the 400-meter freestyle and fourth in the 200 free at the trials. He won gold at the 2011 world championships as part of the 800 free relay.
Sylvia Fowles, Chicago Sky, basketball: The 6-foot-6 center averaged 13.4 points in Beijing, her first Olympics. She is on a women's team seeking an unprecedented fifth straight gold medal, and with Lisa Leslie retired, Fowles should play an even larger role.
Matt Grevers, Lake Forest, swimming (100 back, 400 free relay): The 2008 silver medalist overcame a major slump to earn an Olympic spot at the U.S. trials last month with the second-fastest time ever posted in the 100-meter backstroke. The Lake Forest High School and Northwestern graduate won the final in 52.08 seconds, making him a gold-medal favorite in London.
Dawn Harper, East St. Louis, track and field (100 hurdles): A surprise gold medalist in Beijing, Harper is looking to defend her title but will have to battle teammate Lolo Jones for the spotlight.
Jake Herbert, Northwestern University, wrestling (84kg freestyle): The most decorated wrestler in Northwestern history, Herbert won the Hodge Trophy in 2009 as the nation's top college wrestler and won a silver medal in the 185-pound class at the world championships later that year. He could factor into medal mix if the bracket breaks his way.
Andre Iguodala, Springfield, basketball: The first-time Olympian is being asked to reprise his role as a defensive stopper for the Philadelphia 76ers. With international play more wide open and often featuring smaller lineups, the role will be crucial.
Evan Jager, Algonquin, track and field (3,000 steeplechase): The Jacobs High School graduate broke the American steeplechase record in his first international competition. Despite having run only five races in his career, he has the eighth-fastest time in the world this year.
Grant James, DeKalb, rowing (men's eight): Grant and his twin, Ross, knew nothing about rowing when they were recruited to row for the University of Wisconsin after a coach spotted the 6-foot-5 twins in line at freshman orientation.
Ross James, DeKalb, rowing (men's eight): The James brothers, who expect to room together in the Olympic Village, are one of two sets of twins on the U.S. team. (The other is tennis players Bob and Mike Bryan.)
Amy LePeilbet, Crystal Lake, soccer: The defender is a graduate of Prairie Ridge High School.
Gia Lewis-Smallwood, Champaign, track and field (discus): The former Illini athlete attended Centennial High School.
Christina Loukas, Riverwoods, diving (3m springboard): She was a three-time state champion at Deerfield High School.
Tyler McGill, Champaign, swimming (100 fly): McGill beat out Ryan Lochte last month to secure a spot on the Olympic team. He won his first world championship medal last year — a bronze in the 100-meter butterfly — making a medal in London possible.