Martinez participated in the 20 km race of the Pan American Race Walking Cup in 1990.
[['[TABLECONTEXT]', 'COMPETITION', 'Pan American Race Walking Cup'], ['Pan American Race Walking Cup', 'EVENT', '20 km'], ['[TABLECONTEXT]', '[TITLE]', 'Julio René Martínez'], ['Pan American Race Walking Cup', 'YEAR', '1990']]