Editor's note: Free agency has begun and Keith Law picks out possible best values, worst values and trade targets across every position group. He already has written about the outfielders, the infielders/catchers and the relievers, and here's a look at starting pitchers who have hit free agency, as well as some potential trade targets.

Just to recap from my top 50 free agents, here are all the free-agent starters who produced at least 2 WAR in 2016: Rich Hill, Jeremy Hellickson, Bartolo Colon, Ivan Nova.

That's it.

Colon is a week older than I am. Hellickson got a qualifying offer, so signing him means ceding your first-round draft pick in June. Hill was in independent ball 18 months ago, and threw all of 110 innings this past year. Nova had an ERA just under 5.00 with the Yankees when he was traded to Pittsburgh at the deadline, after which he turned into Bob Tewksbury, walking three batters in 11 starts for the Bucs. Those are the best guys on the market. I don't have potential bargains to list for you at this position, and if I try to rattle off starting pitchers I'd probably avoid, you'll just think I'm mean.

If you're a major league general manager or president looking for rotation help this winter, you're spending more time evaluating trade possibilities than free agents. So let's go right to those:

Trade targets

Zack Greinke, Arizona Diamondbacks: The D-backs' new front office has a difficult task ahead of them in the long term, as Greinke is set to earn about a third of the team's total payroll for each of the next four years, leaving them very little flexibility to add outside talent or re-sign any current players to lucrative long-term deals.