 In the past, professional riders were included in the United States Cycling Federation's Elite Men's National Time Trial Championship event.But since the professional aspect of the sport continues to grow in America, a separate championship for male professional riders was introduced in 2006, known as the USPRO championships.They were held along with the USPRO Road Race championships in Greenville, South Carolina, S.C. on Labor Day weekend, on a 32.3 km course (20.1 miles), the same course has been used for each USPRO championship since.