1973, bobby riggs beats u.s. open champchampion, margaret co in an exhibition match. the cover of "sports illustrated" gloats never bet against this man with his picture. bi billie jean king wants to take that bet. the battle of the sexes to take place at the houston astrodome, the most famous construction since the pyramids. 90 million people in 37 countries around the world tune in to watch that. and in a career where billie jean king would win 140 career titles, 39 grand slams, a career that would also see her get presidential medal of freedom, where billie jean king is remembered for most is how she changed the american landscape for women 40 years ago this week. >> mrs. king trounced riggs in three straight sets last night, it wasn't much of a contest. riggs had said over and over he would psych out mrs. king, but mrs. king ran her 55-year-old