Athletes from seven different countries won gold medals on day one of the Pan American Sambo Championships ©FIAS

Mexican fighters won five gold medals as athletes from seven different countries climbed atop the podium on the opening day of the Pan American Sambo Championships in Alajuela.

Uziel Natanael Estrada won the men's under-58 kilograms title, Jesus Suastegui Caballero was the under-71kg victor and Miguel Angel Barcenas triumphed at under-88kg as Mexicans dominated men's competition in Costa Rica.

Brazilian Herval Silva was the only non-Mexican men's gold medallist, in the over-88kg category.

Emanuel Arzola won combat sambo gold for Mexico in the men's under-79kg and Katya Lopez did the same in the women's under-54kg category.

Lopez defeated Maris Vignolo from Argentina in the final, while Arzola saw off Costa Rica's Herminio Mora.

The host nation did win three titles, however.

Jessica Perez is the new continental champion in the women's under-50kg division, Reina Cordoba triumphed at under-59kg, and Nicole Castro beat Carmen Guadalupe of Mexico for the women's combat sambo under-80kg crown.

Costa Ricans won eight medals in all at the Montserrat Sports Complex.

Audrey Puello, at over-80kg, and under-72kg fighter Maria Pena won women's gold medals for the Dominican Republic.

Liam MacFadyen from Canada, in the men's combat sambo under-64kg, Bolivia's Nestor Cazasola up at under-98kg men's combat sambo, and Fabiana Josa in the women's combat sambo under-65kg - representing the United States - were the other winners.

Two more days of competition are scheduled, with tomorrow's action remaining on the mat and beach competition due up on Sunday (September 11).