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Once the July 31st non-waiver trade deadline passes, teams may only trade players if they have cleared revocable trade waivers or been claimed off of waivers. If a player is claimed, his team may do one of three things: pull him back off waivers and keep him for the remainder of the season, trade him to the claiming team for negotiated compensation, or award the player to the claiming team without compensation. If a player clears waivers, the team can trade him to any team in the league. Most players are placed on waivers during August, and only a few get leaked out to the public. Don't read too much into a player's placement on waivers--it rarely means anything.
Here's where we will keep track of all of the waiver wire movement this August:
Placed on revocable trade waivers (unknown if they cleared or not):
Aaron Harang (Mariners) - August 2nd, according to Nick Cafardo of the Boston Globe
Placido Polanco (Marlins) - August 2nd, according to Nick Cafardo of the Boston Globe
Mike Gonzalez (Brewers) - August 2nd, according to Nick Cafardo of the Boston Globe
Brandon League (Dodgers) - August 3rd, according to Nick Cafardo of the Boston Globe
Paul Konerko (White Sox) - August 12th, according to Ken Rosenthal of FOXSports.com
Jason Vargas (Angels) - August 19th, according to Ken Rosenthal of FOXSports.com
Erick Aybar (Angels) - August 19th, according to Ken Rosenthal of FOXSports.com
Rafael Betancourt (Rockies) - August 22nd, according to Ken Rosenthal of FOXSports.com.
Heath Bell (Diamondbacks) - August 26th, according to Jon Heyman of CBSSports.com.
Yovani Gallardo (Brewers) - August 26th, according to Ken Rosenthal of FOXSports.com.
Pedro Feliciano (Mets) - August 27th, according to Adam Rubin of ESPNNewYork.com.
David DeJesus (Rays) - August 27th, according to Ken Rosenthal of FOXSports.com.
Wesley Wright (Rays) - August 27th, according to Ken Rosenthal of FOXSports.com.
Francisco Rodriguez (Orioles) - August 27th, according to Ken Rosenthal of FOXSports.com.
Ervin Santana (Royals) - August 27th, according to Ken Rosenthal of FOXSports.com.
Cleared waivers (eligible to be traded to any team):
Michael Young (Phillies) - August 8th, according to Ken Rosenthal of FOXSports.com.
Jimmy Rollins (Phillies) - August 8th, according to Jon Heyman of CBSSports.com.
Adam Dunn (White Sox) - August 9th, according to Jon Heyman of CBSSports.com.
Josh Johnson (Blue Jays) - August 10th, according to Jon Heyman of CBSSports.com.
Barry Zito (Giants) - August 13th, according to Jon Heyman of CBSSports.com.
Justin Morneau (Twins) - August 14th, according to Mike Berardino of the St. Paul Pioneer Press.
Dan Haren (Nationals) - August 14th, according to Ken Rosenthal of FOXSports.com.
Matt Lindstrom (White Sox) - August 14th, according to Ken Rosenthal of FOXSports.com.
Brendan Ryan (Mariners) - August 14th, according to Ken Rosenthal of FOXSports.com.
Matt Guerrier (Cubs) - August 14th, according to Ken Rosenthal of FOXSports.com.
Erik Bedard (Astros) - August 14th, according to Ken Rosenthal of FOXSports.com.
Elvis Andrus (Rangers) - August 15th, according to Danny Knobler of CBSSports.com.
Claimed off waivers and pulled back (won't be traded this month):
Mark DeRosa (Blue Jays) - claiming team unknown - August 7th, according to Ken Rosenthal of FOXSports.com.
Kyle Lohse (Brewers) - claimed by Braves - August 9th, according to Ken Rosenthal of FOXSports.com.
Kendrys Morales (Mariners) - claimed by unknown team - August 29th, according to Jon Heyman of CBSSports.com.
Chase Headley (Padres) - claimed by unknown team - August 29th, according to Jon Heyman of CBSSports.com.
Josh Willingham (Twins) - claimed by Orioles - August 30th, according to Phil Miller of the Star Tribune.
Tim Lincecum (Giants) - claimed by unknown team - August 30th, according to Jon Heyman of CBSSports.com.
Hunter Pence (Giants) - claimed by unknown team - August 30th, according to Jon Heyman of CBSSports.com.
Javier Lopez (Giants) - claimed by unknown team - August 30th, according to Jon Heyman of CBSSports.com.
Traded:
Alex Rios (White Sox) - traded to Rangers for Leury Garcia - August 9th
Leury Garcia (Rangers) - traded to White Sox for Alex Rios - August 11th
Jamey Carroll (Twins) - traded to Royals for a PTBNL or cash - August 11th
Wesley Wright (Astros) - traded to Rays for cash - August 12th
Emilio Bonifacio (Blue Jays) - traded to Royals for PTBNL or cash - August 14th
Travis Blackley (Astros) - traded to Rangers for cash - August 14th
David DeJesus (Cubs) - traded to Nationals for a PTBNL or cash - August 19th
Kurt Suzuki (Nationals) - traded to Athletics for Dakota Bacus - August 23rd
David DeJesus (Nationals) - traded to Rays for PTBNL or cash - August 23rd
Marlon Byrd (Mets) - traded to Pirates with John Buck for Vic Black and Dilson Herrera - August 27th
John Buck (Mets) - traded to Pirates with Marlon Byrd for Vic Black and Dilson Herrera - August 27th
Vic Black (Pirates) - traded to Mets with Dilson Herrera for Marlon Byrd and John Buck - August 27th
Michael Morse (Mariners) - traded to Orioles for Xavier Avery - August 30th
Xavier Avery (Orioles) - traded to Mariners for Michael Morse - August 30th
John Axford (Brewers) - traded to Cardinals for a PTNBL - August 30th
Jason Kubel (Diamondbacks) - traded to Indians for PTBNL or cash - August 30th