Mario E. Martínez Guzmán[1] (born 12 September 1961) is a former professional tennis player from Bolivia.

Martínez achieved a career-high singles ranking of world No.

35 in September 1983.

He participated in three Davis Cup ties for Bolivia from 1977–1978 and one more in 1988, posting a 3–5 record in singles and an 0–2 record in doubles.