Juan Luis Sainfleur Hernández (born February 17, 1982) is a sprinter from the Dominican Republic specializing in the 100 metres.
He won a bronze medal at the 2004 Ibero-American Championships. Participating in the 2004 Summer Olympics, he failed to finish in his 100 metre heat, thus failing to make it through to the second round. He also participated at the 2005 World Championships, exiting in the quarter-finals.
He finished fifth at the 2006 Central American and Caribbean Games.[1]
His personal best time is 10.22 seconds, achieved in May 2004 in Santo Domingo.
| Year | Competition | Venue | Position | Event | Notes |
|---|---|---|---|---|---|
Representing the  Dominican Republic
| |||||
| 2002 | NACAC U-25 Championships | San Antonio, Texas, United States | 5th (h) | 200m | 21.56 (wind: +1.6 m/s) |
| Central American and Caribbean Games | San Salvador, El Salvador | 5th | 100m | 10.47 w (wind: 2.1 m/s) | |
| 1st | 4x100m relay | 39.41 | |||
| 2004 | South American U23 Championships | Barquisimeto, Venezuela | 2nd [2] | 4x100m relay | 39.84 |
| NACAC U-23 Championships | Sherbrooke, Canada | 5th | 4x100m relay | 41.30 | |
| 5th | 4x400m relay | 3:18.00 | |||
