ESKILSTUNA, SWEDEN - JULY 17: Laviai Nielsen of Great Britain celebrates winning the Women's 400m final at Ekangen Arena on July 17, 2015 in Eskilstuna, Sweden. (Photo by Joosep Martinson/Getty Images)
ESKILSTUNA, SWEDEN - JULY 17: Laviai Nielsen of Great Britain celebrates winning the Women's 400m final at Ekangen Arena on July 17, 2015 in Eskilstuna, Sweden. (Photo by Joosep Martinson/Getty Images)