| Roles | Competed in Olympic Games |
|---|---|
| Sex | Male |
| Full name | Eulalio•Ríos Alemán |
| Used name | Eulalio•Ríos |
| Born | 21 January 1935 in Huajuapan de León, Oaxaca (MEX) |
| Measurements | 162 cm / 75 kg |
| NOC | Mexico |
Eulalio Ríos had the following podium finishes at major championships: 1st in the 1955 Pan American Games 200 metre butterfly, 3rd in the 1955 Pan American Games 4×100 metre medley (with Clemente Mejía, Walter Ocampo, and Otilio Olguín), 3rd in the 1959 Pan American Games 200 metre butterfly, 3rd in the 1959 Pan American Games 4×100 metre medley (with Alejandro Gaxiola, Jorge Escalante, and the non-Olympian Roberto Marmolejo).
Died circa 1980.
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1956 Summer Olympics | Swimming (Aquatics) | MEX |
Eulalio Ríos | |||
| 200 metres Butterfly, Men (Olympic) | 6 | |||||
| 1960 Summer Olympics | Swimming (Aquatics) | MEX |
Eulalio Ríos | |||
| 200 metres Butterfly, Men (Olympic) | 10 |