The U.S. 4x200 women's meters race team walks off the track after not finishing the race due to a collision between teammates during a handoff of the baton at the IAAF World Relays Championships in Nassau Bahamas, May 2, 2015. From left are Kimberlyn Duncan, Jeneba Tarmoh, Shalonda Solomon and Allyson Felix. REUTERS/Mike Segar 

The U.S. women's 4x200 metres relay team celebrates on the podium after winning the gold medal in the event during the IAAF World Relays Championships in Nassau, Bahamas, May 25, 2014. From left to right are Shalonda Solomon, Tawanna Meadows, Bianca Knight and Kimberlyn Duncan. REUTERS/Mike Segar (BAHAMAS - Tags: SPORT ATHLETICS) 

Runner Allyson Felix (C) competes in the women's 100 meters qualifying against fellow runners Shalonda Solomon (L) and Miki Barber at the U.S. Olympic athletics trials in Eugene, Oregon, June 22, 2012. REUTERS/Lucy Nicholson (UNITED STATES - Tags: SPORT OLYMPICS ATHLETICS TPX IMAGES OF THE DAY) 

Veronica Campbell-Brown (C) of Jamaica crosses the finish line infront of Carmelita Jeter (2nd R), Allyson Felix (R) and Shalonda Solomon (2nd L) of the U.S. and Sherone Simpson of Jamaica during the woman's 200 metres final at the IAAF World Championships in Daegu September 2, 2011. REUTERS/Michael Dalder (SOUTH KOREA - Tags: SPORT ATHLETICS)

Veronica Campbell-Brown of Jamaica (2nd L) crosses the finish line ahead of Shalonda Solomon of the U.S. (L), Carmelita Jeter of the U.S. (C), Allyson Felix of the U.S. (2nd R) and Hrystyna Stuy of Ukraine (R) winning the women's 200 metres final at the IAAF World Athletics Championships in Daegu, September 2, 2011. REUTERS/David Gray (SOUTH KOREA - Tags: SPORT ATHLETICS)

Veronica Campbell-Brown (2nd L) of Jamaica crosses the finish line infront of Carmelita Jeter (2nd R), Allyson Felix (R) and Shalonda Solomon of the U.S. during the woman's 200 metres final at the IAAF World Championships in Daegu September 2, 2011. REUTERS/Michael Dalder (SOUTH KOREA - Tags: SPORT ATHLETICS)

Veronica Campbell-Brown of Jamaica (C) leans at the finish line ahead of Shalonda Solomon of the U.S. (L) and Carmelita Jeter of the U.S. (R) winning the women's 200 metres final at the IAAF World Athletics Championships in Daegu, September 2, 2011. REUTERS/David Gray (SOUTH KOREA - Tags: SPORT ATHLETICS)

Veronica Campbell-Brown of Jamaica leans at the finish line ahead of Shalonda Solomon of the U.S. (back) to win the women's 200 metres final at the IAAF World Championships in Daegu September 2, 2011. REUTERS/Dylan Martinez (SOUTH KOREA - Tags: SPORT ATHLETICS)

Shalonda Solomon holds an American flag after winning the women's 200 meter dash at the U.S. Outdoor Track and Field Championships in Eugene, Oregon, June 26, 2011. REUTERS/Steve Dykes (UNITED STATES - Tags: SPORT ATHLETICS) 

Shalonda Solomon (L) crosses the finish line ahead of Carmelita Jeter (C) and Kimberlyn Duncan (R) to win the women's 200 meter dash at the U.S. Outdoor Track and Field Championships in Eugene, Oregon, June 26, 2011. REUTERS/Steve Dykes (UNITED STATES - Tags: SPORT ATHLETICS) 

The U.S. women's team of (L-R) Cydonie Mothersille, Debbie Ferguson-McKenzie, Kelly-Ann Baptiste and Shalonda Solomon celebrate after winning the 4x100 metres relay women's race at the IAAF Continental Cup 2010 in Split September 4, 2010. REUTERS/Matko Biljak (CROATIA - Tags: SPORT ATHLETICS) 

Allyson Felix (C) of the U.S. crosses the finish line to win the women's 200 m event ahead of Shalonda Solomon of the U.S. (L) and Kelly-Ann Baptiste of Trinidad and Tobago at the IAAF Diamond League athletics meeting at the Stade de France Stadium in Saint-Denis, near Paris July 16, 2010. REUTERS/Gonzalo Fuentes (FRANCE - Tags: SPORT ATHLETICS) 

Torri Edwards (L-R) sprints to the finish line to win her women's 100 meters semifinal heat ahead of Mechelle Lewis, Shalonda Solomon and LaShaunte'a Moore at the U.S. Olympic Track and Field Trials in Eugene, Oregon June 28, 2008. REUTERS/Jason Reed (UNITED STATES) (BEIJING OLYMPICS 2008 PREVIEW)