Some agencies are more open to multiyear extensions for their clients than others. The Boras Corporation is notorious for avoiding such deals. In the last three years, only Boras clients Carlos Gonzalez and Jered Weaver signed significant extensions, with Prince Fielder and Stephen Drew signing two-year deals covering arbitration years. Certainly the agency's number of clients will correlate to its volume of extensions, and unfortunately I don't have the complete data needed to give a percentage of clients extended. Using MLBTR's Transaction Tracker, these agencies have brokered the most extensions since the beginning of 2009:
- CAA Sports (13)
- Octagon (9)
- Beverly Hills Sports Council (8)
- SFX (7)
- ACES (6), Praver/Shapiro (6), Sosnick Cobbe (6), Wasserman Media Group (6)
- Legacy Sports Group (5), LSW Baseball (5), Moye Sports Associates (5)
Most active GMs have authored at least one contract extension since 2009, with exceptions for recent hires Dan Duquette, Ben Cherington, Terry Ryan, Jerry Dipoto, and Jeff Luhnow. The leaders:
- Dan O'Dowd/Rockies (10)
- John Mozeliak/Cardinals (8), Kenny Williams/White Sox (8), Ruben Amaro Jr./Phillies (8)
- Doug Melvin/Brewers (7)
- Andrew Friedman/Rays (6), Brian Sabean/Giants (6), Ned Colletti/Dodgers (6), Walt Jocketty/Reds (6), Theo Epstein and Jed Hoyer/Cubs (6)
- Alex Anthopoulos/Blue Jays (5), Dave Dombrowski/Tigers (5)
White Sox GM Kenny Williams and CAA Sports appear high on both lists, so perhaps John Danks' recent deal shouldn't have been a surprise. Carlos Quentin is another CAA client. Ned Colletti, Andre Ethier, and CAA make another good combination. Also on the CAA front, I wonder if Alex Anthopoulos has broached an extension for Brett Lawrie. The Cubs' Matt Garza is another name to consider here.
Other combinations of extension-prone agencies and GMs might bode well for Hunter Pence, Shane Victorino, John Axford, Nyjer Morgan, Tim Lincecum, Madison Bumgarner, Melky Cabrera, Jeremy Affeldt, Kelly Johnson, Brandon Morrow, Jason Motte, Brandon Phillips, Delmon Young, Starlin Castro, Geovany Soto, Ryan Dempster, and Philip Humber. Of course, those who just finished off-years are less likely to be extended now.