Here's a list of pending free agent starters and closers plenty of interesting scenarios can emerge as we near the july 31st trade deadline.

Starting pitchers
Scott Baker (31) - $9.25MM club option
Erik Bedard (34)
Joe Blanton (32)
Fausto Carmona (29) - $9MM club option
Bartolo Colon (40)
Aaron Cook (34)
Kevin Correia (32)
Doug Davis (37)
Jorge De La Rosa (32) - $11MM player option with a $1MM buyout
Ryan Dempster (36)
R.A. Dickey (38) - $5MM club option with a $300K buyout
Zach Duke (30)
Scott Feldman (29) - $9.25MM club option with a $600K buyout
Jeff Francis (32)
Gavin Floyd (30) - $9.5MM club option
Freddy Garcia (37)
Zack Greinke (28)
Jeremy Guthrie (34)
Cole Hamels (29)
Rich Harden (31)
Dan Haren (32) - $15.5MM club option with a $3.5MM buyout
Livan Hernandez (38)
Tim Hudson (37) - $9MM club option with a $1MM buyout
Edwin Jackson (29)
Hiroki Kuroda (38)
Colby Lewis (33)
Francisco Liriano (29)
Kyle Lohse (34)
Rodrigo Lopez (37)
Derek Lowe (40)
Paul Maholm (31) - $6.5MM club option with a $500K buyout
Shaun Marcum (31)
Jason Marquis (34)
Daisuke Matsuzaka (32)
Brandon McCarthy (29)
Kevin Millwood (38)
Jamie Moyer (50)
Brett Myers (32) - $10MM vesting option with a $3MM buyout
Ramon Ortiz (40)
Roy Oswalt (35)
Carl Pavano (37)
Jake Peavy (31) - $22MM club option with a $4MM buyout
Brad Penny (35)
Joel Pineiro (34)
Anibal Sanchez (29)
Jonathan Sanchez (30)
Ervin Santana (30) - $13MM club option with a $1MM buyout
Joe Saunders (32)
James Shields (31) - $9MM club option with a $1.5MM buyout
Chien-Ming Wang (33)
Jake Westbrook (35) - $8.5MM mutual option with a $1MM buyout if club declines
Randy Wolf (36) - $10MM club option with a $1.5MM buyout
Chris Young (34)
Carlos Zambrano (32)
Closers
Jonathan Broxton (29)
Matt Capps (29) - $6MM club option with a $250K buyout
Francisco Cordero (38)
Kyle Farnsworth (37)
Brandon League (30)
Ryan Madson (32) - $11MM mutual option with a $2.5MM buyout
Juan Carlos Oviedo (29)
J.J. Putz (36) - $6.5MM club option with a $1.5MM buyout
Mariano Rivera (43)
Francisco Rodriguez (31)
Joakim Soria (29) - $8MM club option with a $750K buyout
Huston Street (29) - $9MM mutual option with a $500K buyout if club declines
Jose Valverde (35)