Carlos Martinez has made some significant gains against lefties in a small sample this spring, giving hope that he will crack the STL rotation in short order and fulfill his breakout promise.

Kole Calhoun won't sneak up on pitchers again, so do his BPIs say he has staying power? Also, G. Jones, T. Walker, Hollands, Joyce.

Taking a look at a few players whose ADPs have shifted since drafting began.

Troy Tulowitzki—Career year potential or quintessential injury risk? Plus, Yasmani Grandal, Chris Johnson, Jonathan Papelbon, and Dan Haren.

Shields has proven to be a reliable performer over the past several years. Can he keep it up in 2015? Plus, Howie Kendrick, Michael Wacha, Michael Morse, and Brandon McCarthy.

You know you missed him: A-Rod is back. Can he still contribute after missing 2014? Also Buherle, Morales, Robertson, and Dyson.

Taking up the mid-February questions we asked about bullpen roles.

Can Yoenis Cespedes develop into a premier OF? Plus fanalytic looks at Jose Quintana, J.J. Hardy, Michael Pineda, and Luis Valbuena.

OAK speedster Billy Burns has been one of the most impressive players in AL camps so far this spring.

Top prospect Taijuan Walker has been one of the most impressive pitchers in any camp so far this spring.

Here's a team of players who are generally overvalued by fantasy GMs.