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.

Result	No.	Year	Tournament	Surface	Opponent	Score
Win	1.	1980	Bordeaux, France	Clay	Gianni Ocleppo	6–0, 7–5, 7–5
Loss	1.	1980	Cuneo, Italy	Clay	Ricardo Cano	5–7, 2–6
Loss	2.	1981	Nice, France	Clay	Yannick Noah	4–6, 2–6
Win	2.	1981	Venice, Italy	Clay	Paolo Bertolucci	6–4, 6–4
Win	3.	1981	Messina, Italy	Clay	Robbie Venter	6–4, 7–5
Win	4.	1982	Palermo, Italy	Clay	John Alexander	6–4, 7–5
Loss	3.	1982	Messina, Italy	Clay	Pablo Arraya	5–7, 4–6
Win	5.	1983	Messina, Italy	Clay	Patrice Kuchna	6–7, 6–0, 9–7

• Mario Martínez at the Association of Tennis Professionals
• Mario Martínez at the International Tennis Federation
• Mario Martínez at the Davis Cup