Strikeforce welterweight champion Nick Diaz and former IBF super-middleweight champion Jeff Lacy have agreements in place to box this fall, representatives for both fighters confirmed Friday. According to a release issued by promoter Don Chargin, Lacy officially signed on to the bout Friday morning. Diaz's manager, Cesar Gracie, told ESPN.com that the 27-year-old mixed martial artist is "tentatively" set to fight Lacy and has signed papers to that effect. Unless Zuffa offers UFC welterweight champion Georges St. Pierre a fight during same time period, Diaz, who ESPN.com currently ranks as the No. 3 welterweight in MMA, will challenge Lacy. Read more: http://sports.espn.go.com/extra/mma/news/story?id=6495020