Career
Originally a 400 metres runner who also enjoyed success in 4 x 400 metres relay, winning the silver medal at the 1992 Olympics, Téllez later converted to the 800 metres distance. At the 1996 Summer Olympics he ran in 1:42.85 and thereby improved the national record of Alberto Juantorena. However, this wasn"t enough to secure a medal as he finished in fourth place.
A silver medal from the 1997 World Championships was his best result thereafter.
200 metres - 21.10 (1994)
400 metres - 45.27 (1994)
800 metres - 1:42.85 (1996).