7:46pm: The Rangers are one of several clubs that placed a claim on Upton, reports MLB.com's T.R. Sullivan. Since they have the best record in the AL, Texas is dead last on the waiver priority list for an NL player.
SATURDAY, 6:48pm: The Red Sox were not the claiming team, reports Nick Cafardo of The Boston Globe (on Twitter). He reiterates that Upton will not be traded.
FRIDAY: Justin Upton has been claimed on waivers by an unidentified team, Jon Heyman of CBSSports.com reports (Twitter links). However, a Diamondbacks official said there's "no chance" of a trade this month.
Diamondbacks managing partner Ken Kendrick told reporters last month that it's a "reasonable assumption" that Upton will stay put for the remainder of the season. It's not at all uncommon for teams to determine trade interest by placing players -- even stars -- on the waiver wire.
Upton will earn $9.75MM in 2013, $14.25MM in 2014 and $14.5MM in 2015. His six-year, $51.25MM contract allows him to block moves to the Yankees, Red Sox, Cubs and Indians.
The Diamondbacks now have until Sunday to select one of three options. They can let Upton (and his contract) go to the claiming team, they can complete a trade with the claiming team, or they can pull him back off of waivers. Expect Arizona to pull Upton back off of waivers.
National League teams had claiming priority on Upton, whose teammate, Joe Saunders, cleared waivers today. Upton, 25, has a .273/.356/.397 batting line with nine home runs in 472 plate appearances this year.
Mike Axisa contributed to this post.