11:27am: Interest in Upton is said to be "huge'' and the Diamondbacks are only interested in making a "perfect" deal, sources tell Jon Heyman of CBSSports.com. Sources say that the outfielder's limited no-trade list is not the same as it was a couple years ago when it consisted of the Tigers, Indians, A's, and Royals. Detroit, Heyman notes, is a team that would have interest in Upton.
10:54am: The Pirates have had preliminary trade discussions involving the Padres' Carlos Quentin and the Diamondbacks' Justin Upton, major league sources tell Jon Paul Morosi of FOX Sports.com. Talent evaluators from both teams have scouted PIttsburgh's farm system in recent days and the teams are preparing lists of prospects they would target in a potential deal.
It is unlikely the Pirates would acquire both outfielders, but they have a strong desire to land one of the two. Quentin, 29, would require a lesser package as he is eligible for free agency after this season. Upton, 24, would cost more in terms of prospects as he is under contract through 2015.
When it comes to trades, the Pirates are said to be more attached to Gerrit Cole than Jameson Taillon, in part because Cole is closer to the big leagues. The D'Backs are looking to compete again in 2013 and would likely target players who are closer to the majors in a deal for Upton. The Padres, meanwhile, are willing to take younger players, as long as they have considerable upside.