Lightweight Mikaela Mayer  began her Rio Olympics journey on the right foot with her

Mikaela Mayer opens the Olympics with unanimous decision victory.

unanimous decision victory over Jennifer Chieng (Micronesia), Friday. The scores were 40-35, 40-35, 39-37.

Mayer will next face Anastasia Beliakova, Monday. If she’s victorious she will clinch at least the Bronze medal.

In other U.S. Olympic action, Carlos Balderas lost a unanimous decision to Cuba’s Lazaro Alvarez in a lightweight fight. All three judges scored the fight 30-27.

Nico Hernandez also suffered a defeat, falling to Uzebekistan’s Hasanboy Dusmatov (30-27, 29-28, 29-28). Hernandez had already clinched the Bronze Medal, making him the U.S. first medalist in boxing since Deontay Wilder in 2008.

Hernandez will receive his Bronze Medal Sunday following the light flyweight Golf Medal fight.

Claressa Shields has her first fight Wednesday.