| Atano III | |
|---|---|
 Mendizábal with a txapela and trophy | |
| Full name | Mariano Juaristi Mendizábal |
| Born | February 21, 1904 Azkoitia, Guipúzcoa |
| Died | January 12, 2001 (aged 96) |
| Country | Spain |
| Province | Gipuzkoa |
| Weight | 84 kg |
| Debut date | 1920] |
| Debut fronton | Azkoitia fronton |
| Position | Forward |
| Singles | |
| 1st Hand-Pelota singles championship | 1940, 1942, 1944, 1946 |
Mariano Juaristi Mendizábal (February 21, 1904 – January 12, 2001) was a Spanish Basque pelota player known as Atano III. He is often considered one of the best pelotaris of all time, dominating the 1st hand-pelota category from 1926 to 1948 and winner of 4 championships (1940, 1942, 1944 and 1946).