USA men’s boxing

U.S. bantamweight Joseph Diaz Jr. of South El Monte walks from the ring after losing to Lazaro Alvarez in the round of 16.  (Robert Gauthier / Los Angeles Times)

American Joseph Diaz Jr. exchanges punches with Cuba’s Lazaro Alvarez during their bantamweight bout.  (Robert Gauthier / Los Angeles Times)

Joseph Diaz Jr. of the U.S. tries to counterpunch against Lazaro Alvarez of Cuba in a bantamweight bout.  (Robert Gauthier / Los Angeles Times)

American Michael Hunter II heads to his corner to get treatment between rounds in his heavyweight fight with Russia’s Artur Beterbiev. Hunter lost despite matching Beterbiev in total points.  (Robert Gauthier / Los Angeles Times)

Michael Hunter II of the U.S., left, works on the inside against Russia’s Artur Beterbiev in their heavyweight bout.  (Robert Gauthier / Los Angeles Times)