Four days to go in the non-waivers trading period, with plenty of action already in the books and more surely to come. Which teams' general managers will be fielding the most phone calls from other clubs and media?

(Just for the sake of accuracy, it's not like the GM actually takes every phone call regarding trades. He has people both below and above him on the food chain to help. But you know what I mean.)

1. Doug Melvin, Milwaukee. Melvin, one of the industry's most experienced GMs, has plenty of experience in both the buyers' and sellers' aisles. He's obviously a seller now, and he has the best remaining trade chip in Zack Greinke.

It's essential that the Brewers do well on this deal. First of all, their farm system has been weakened by aggressive moves the past few years, including the December 2010 acquisition of Greinke from Kansas City, so they need to restock. Secondly, they hoped to have much to sell if they found themselves in this unwelcome scenario, but it turns out they won't be getting anything of consequence - at least not this month - for impending free agents Shaun Marcum (currently down with a right elbow injury) or Francisco Rodriguez (currently terrible).

2. Jon Daniels, Texas. Usually, it's only the Yankees who view their season as a failure if they don't win a World Series. However, the Rangers, having lost the last two Fall Classics - coming one strike away from victory twice in last year's Game 6 against St. Louis - have to feel pretty much the same way.

The Rangers have built up such a talent-filled organization that they can probably get whomever they want. And while there have been some reservations in the past about Greinke's fit in a high-pressure situation - that's why the Yankees aren't interested - he's clearly the best guy out there. That's why most people see Greinke winding up with the Rangers, who have lost Colby Lewis for the season and who seem inclined to return Neftali Feliz to the bullpen once Feliz (who began the season in the starting rotation) completes his rehabilitation.

3. Jed Hoyer, Cubs. For Hoyer and his immediate boss Theo Epstein, 2012 has been all about moving forward. Part of that plan was to trade those who could be traded, and the top two tradeable commodities appeared to be Ryan Dempster and Matt Garza.

But Dempster, who has full no-trade protection, balked at a deal to Atlanta that would have brought back the highly-regarded Randall Delgado. The right-hander appears determined to go to the Dodgers, who, armed with that leverage, aren't offering back a great package. Garza, meanwhile, is dealing with a right triceps condition and won't pitch again until Monday at the earliest. Since he's under control for next year, the Cubs could simply hold onto him and try trading him again over the winter.

4. Frank Wren, Atlanta. While the Red Sox come into The Bronx today still dazed, going back to their 2011 collapse, Boston's fellow '11 meltdowners the Braves have done a better job of bouncing back. Nevertheless, the Braves want another starting pitcher, which is why they were willing to give up so much for the impending free agent Dempster. Greinke is their obvious target now, as they try to make their second postseason appearance in three years.

5. Jerry DiPoto, Angels. The Angels' first-year GM, backed by suddenly aggressive owner Arte Moreno, did some very heavy lifting last offseason with the signings of Albert Pujols and C.J. Wilson. Those pickups, combined with the blossoming of youngsters Mike Trout and Mark Trumbo, have put the Angels right in the race.

The American League wild-card race is fierce, however, and the Angels have only two dependable starting pitchers in Wilson and Jered Weaver. So they'll be in the discussions for Greinke and Tampa Bay's James Shields.

--Have a great day.