Placed On Waivers: Santana, Rodriguez, DeJesus, Willingham

Here's Tuesday's list of players who have been placed on revocable trade waivers…

• Ervin Santana — Ken Rosenthal of FOX Sports tweets that Ervin Santana has been placed on waivers. He instantly becomes one of the most desirable pieces on waivers, but the Royals are likely not inclined to move him. Santana, 30, has a 3.21 ERA with 7.1 K/9 and 2.1 BB/9 in what has been a tremendous rebound campaign with the Royals. He's owed about $2.23MM this season and is a free agent at season's end. However, Kansas City is still within striking distance of a Wild Card spot and will be making Santana a qualifying offer following the season, so a return would likely have to overwhelm them.
• Francisco Rodriguez — Rosenthal's tweet also reported that K-Rod has been placed on waivers by the Orioles. This is likely nothing more than a procedural move, as he's been solid for the O's, and they're just 2.5 games back from a Wild Card spot.
• Wesley Wright, David DeJesus — Rosenthal also noted that the Rays have put both of their most recent waiver pickups back on waivers. However, in a second tweet he cautions that DeJesus needn't be worried this time, as the Rays are merely putting all of their players through waivers as a procedural move right now, which explains Wright's placement as well.
• Josh Willingham — Peter Gammons of the MLB Network tweets that the Twins have placed Willingham on waivers. Minnesota was expecting big things out of Willingham following a 35-homer season in 2012, but knee injuries diminished his production at the plate and he ultimately underwent arthroscopic knee surgery in early July. Since being activated on Aug. 9, he's batting just .177/.316/.371 with a pair of homers and six doubles. Willingham's walk rate (13.4 percent) and power (.179 ISO) remain strong, but his strikeout rate is up (26.7 percent) and his average is down due to a decrease in line drives and an increase in pop-ups. He's owed roughly $1.3MM for the remainder of the season and is owed $7MM in 2014 — the final season of a three-year, $21MM contract.
• Earlier today, Adam Rubin of ESPN New York reported that Marlon Byrd, Pedro Feliciano and John Buck of the Mets were all on waivers, and at least one trade is likely. Byrd was claimed by an unknown NL team shortly thereafter.

For a reminder on how revocable trade waivers and August trades work, check out MLBTR's August trades primer. You can see who is available to be traded to any team by checking MLBTR's list of players who have cleared waivers.