Jason Lempert

CBS Sports Staff

Rio Olympics results: USA earns more gold, winning men's 4x400m relay

LaShawn Merritt anchors the Americans in the final leg of the race

Rio Olympics results: Allyson Felix, USA outlast Jamaica for 4x400m relay gold

The U.S. wins its sixth straight gold medal in the 4x400m relay

Rio Olympics 2016: Matt Centrowitz wins USA's first 1,500m gold in 108 years

More history is made in Rio as the Americans get another gold medal

Rio Olympics 2016: U.S. team alternate Danell Leyva wins two silvers in gymnastics

Leyva seized his chance and made the most of it

Rio Olympics 2016: Chinese diver gets silver medal, diamond ring within minutes

Moments after winning a medal, He Zi said 'yes'

Red Sox call up OF Rusney Castillo from Triple-A

Castillo, who signed a $72 million contract last year, is considered a top-25 prospect by Baseball America.