The Amazing Race 13

Ken Greene, a 51-year-old home-builder and ex-NFL player from San Diego, and Tina Greene, a 48-year-old president of BioPharmMed from Tampa, Fla., are a married-but-separated couple and one of the teams competing in this race around the world

"The Amazing Race 13" premieres ... moreSunday, Sept. 28, at 8 p.m. ET/PT on CBS.

(CBS)