Martínez achieved a career-high singles ranking of World No. 35 in 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.
Round 1
Mario Martinez 1 *
Daniel C. (Dan) Goldie
6-3
7-6
Round 2
Mario Martinez 1 *
Ramesh Krishnan
6-7
6-2
6-1
Round 3
Mario Martinez 1 *
Mel Purcell
4-6
7-6
6-1
Quarterfinals
Mario Martinez 1 *
Claudio Panatta
7-6
3-6
6-2
Semifinals
Jose Luis Clerc 1 *
Mario Martinez
6-3
6-2
Round 1
Mario Martinez 1 *
Steffan Svensson
6-3
6-3
Round 2
Mario Martinez 1 *
Bruno Capineri
6-4
6-1
Quarterfinals
Mario Martinez 1 *
Juan Aguilera
6-3
1-6
6-4
Semifinals
Mario Martinez 1 *
Johan Carlsson
4-6
6-2
6-2
Final
Mario Martinez 1 *
Patrice Kuchna
6-7
6-0
9-7
Round 1
Mario Martinez 1 *
Gianni Ocleppo
2-6
7-6
6-3
Round 2
Mario Martinez 1 *
Andres Gomez
6-7
6-4
7-6
Quarterfinals
Mario Martinez 1 *
Pablo Arraya
6-1
7-6
Semifinals
Mario Martinez 1 *
Balazs Taroczy
4-6
6-2
6-1
Final
Mario Martinez 1 *
John Alexander
6-4
7-5
Round 1
Mario Martinez 1 *
Juan Antonio Fernandez
7-5
6-1
Round 2
Mario Martinez 1 *
Martin Jaite
6-1
6-2
Quarterfinals
Mario Martinez 1 *
Patrice Kuchna
6-3
6-1
Semifinals
Mario Martinez 1 *
Antonio Zugarelli
6-3
6-2
Final
Pablo Arraya 1 *
Mario Martinez
7-5
6-4
Round 1
Mario Martinez 1 *
Gerard Toulon
6-3
6-2
Round 2
Mario Martinez 1 *
Fernando Luna
2-6
6-1
6-2
Quarterfinals
Mario Martinez 1 *
Ricardo Cano
6-0
6-3
Semifinals
Mario Martinez 1 *
Balazs Taroczy
6-3
6-2
Final
Yannick Noah 1 *
Mario Martinez
6-4
6-2
Round 1
Mario Martinez 1 *
Fernando Luna
6-4
6-3
Round 2
Mario Martinez 1 *
Stanislav Birner
6-1
3-6
6-4
Quarterfinals
Mario Martinez 1 *
José Higueras
6-1
6-2
Semifinals
Mario Martinez 1 *
Marcos Hocevar
6-2
7-5
Final
Mario Martinez 1 *
Paolo Bertolucci
6-4
6-4
Round 1
Mario Martinez 1 *
Karl Meiler
6-1
6-0
Round 2
Mario Martinez 1 *
Scott Lipton
6-3
6-0
Quarterfinals
Mario Martinez 1 *
Gianni Marchetti
6-2
6-1
Semifinals
Mario Martinez 1 *
Brent Pirow
6-4
6-0
Final
Mario Martinez 1 *
Robbie Venter
6-4
7-5
Round 1
Mario Martinez 1 *
Jan Kodes
6-2
6-4
Round 2
Mario Martinez 1 *
Paul C. Kronk
6-3
6-0
Round 3
Mario Martinez 1 *
Jose Luis Damiani
6-2
6-2
Quarterfinals
Mario Martinez 1 *
Eddie Dibbs
7-6
6-2
Semifinals
Mel Purcell 1 *
Mario Martinez
6-1
6-3
Round 1
Mario Martinez 1 *
Marco Ferrari
6-0
6-3
Round 2
Mario Martinez 1 *
Gianni Marchetti
6-1
6-7
6-2
Quarterfinals
Mario Martinez 1 *
Dominique Bedel
6-2
6-4
Semifinals
Mario Martinez 1 *
Christophe Casa
6-0
4-6
6-0
Final
Ricardo Cano 1 *
Mario Martinez
7-5
6-2
Round 1
Mario Martinez 1 *
John Yuill
5-7
6-4
6-4
Round 2
Mario Martinez 1 *
Gilles Moretton
6-1
6-3
Quarterfinals
Mario Martinez 1 *
Jérôme Potier
6-3
6-2
Semifinals
Mario Martinez 1 *
Ricardo Ycaza
6-2
4-6
6-3
Final
Mario Martinez 1 *
Gianni Ocleppo
6-0
7-5
7-5