it was a u.s. open final for the ages, but not necessarily for all the right reasons. 20-year-old naomi osaka won her first grand slam tennis title becoming the first japanese player to accomplish the feat. and she did it upsetting the favorite, serena williams. but the match may be remembered for williams' clashing with the chair umpire calling him a thief and smashing her racket. what caused all of that? here's andy scholes. >> reporter: absolute chaos breaking out at the u.s. open women's final on saturday. it's going to go down as one of the most controversial matches in tennis history. serena williams already dropped the first set to naomi osaka. in the second set, carlos ramos issued her a warning for seiching coaching from her coach, patrick mouratoglou from the stands. that's when serena approached