10:50pm: Taijuan Walker would have been the fourth player in the trade package to the D'Backs, reports Jon Heyman of CBS Sports (via Twitter). Walker, a 20-year-old right-hander, was ranked as the 20th-best prospect in the sport by Baseball America prior to the 2012 season, though he struggled pitching at the Double-A level last year.
7:40pm: The Mariners offered a four-player package to the D'Backs, according to Scott Miller of CBS Sports. Arizona would have received Nick Franklin, Charlie Furbush, Stephen Pryor and one of Taijuan Walker, Danny Hultzen or James Paxton.
6:06 pm: Diamondbacks outfielder Justin Upton invoked his limited no-trade clause to reject an agreed-upon deal between the D'Backs and Mariners that would have sent Upton to Seattle, reports Ken Rosenthal and Jon Paul Morosi of FOX Sports. The M's were prepared to give up "a package of young talent" in the trade, a return that Nick Piecoro of the Arizona Republic has heard was "substantial" (Twitter link).
Though several teams have been linked to Upton over the last two seasons, the Mariners seem to be the first to propose a deal that has gotten the D'Backs to agree to move the 25-year-old outfielder. As Rosenthal/Morosi note, the trade rejection could be gamesmanship by either Upton or the D'Backs --- Upton could be trying to control where he ends up, or the Snakes are sending the message that if Upton wants to leave Arizona, his only option is Seattle. The Mariners, Blue Jays, Red Sox and Cubs are the four teams on Upton's current no-trade list, according to ESPN's Jerry Crasnick (Twitter link).