MLB.com fantasy expert Fred Zinkie fielded questions from fans during a live Twitter chat (at @fantasy411) on Monday. Read through the best of the Q&A below. Questions and answers have been edited for clarity.
@TravisJayLyon: Would you drop Aledmys Diaz for Jhonny Peralta?
Zinkie: Yes, I would. I expect them to give similar production this summer. But Peralta is arguably safer.

@FortonJohnny: Should I replace Randal Grichuk with Robbie Grossman, Corey Dickerson or Justin Turner?
Zinkie: Go with Turner. He is hitting well from a premium lineup spot. Also, he was very good in 2015.
@jakefunkhouser: In a 16-team league, would you rather own Addison Russell or Tim Anderson?
Zinkie: In a deep league, I'll take the safety of Russell. In a 10-team league, I would have chosen Anderson.
@AdamGIvany: I am stashing Dee Gordon. Should I drop Javier Baez for Starlin Castro?
Zinkie: Yes, you should drop Baez for Castro.
@nickk_howardd: Is it time to give up on Marcus Stroman?
Zinkie: He can be dropped in shallow leagues. His low strikeout rate limits his upside.
@thegoldrushh: Please rank Blake Snell, Rick Porcello, Zach Davies and Matt Shoemaker.
Zinkie: Shoemaker, Snell, Porcello, Davies.
@dyl_picks: Which infielder should I drop out of Troy Tulowitzki, Jung Ho Kang and Jonathan Villar?
Zinkie: Drop Tulowitzki. Villar and Kang have played too well to be dropped.

@LyndonBryanton: How do you expect John Lackey to fare the rest of the season? Should I give up Rich Hill for him?
Zinkie: I expect Lackey to be very consistent. I prefer him to Hill, due to Hill's injury risk.
@rutpharmknights: What kind of value will Derek Dietrich have after Gordon returns? Should I trade him now?
Zinkie: He will likely be a high-volume bench player when Gordon returns. This is a good time to trade him.
@ljdobson9: Would you rather own Santiago Casilla or Shawn Kelley for the rest of the season?
Zinkie: I'll take Casilla. Kelley is unlikely to earn saves all season.
@yohechris: Would you rather own Devon Travis or Whit Merrifield for the rest of the season?
Zinkie: I will take Travis. Merrifield has a .400 BABIP at the moment.
@Khalchono: Which pitcher should I keep out of Shelby Miller, Yovani Gallardo or Jaime Garcia?
Zinkie: Keep Garcia. But keep a close eye on Miller's start Monday.

@SslaydenMlb: Is Seung Hwan Oh going to take over closing duties in St. Louis?
Zinkie: He should definitely be rostered in all leagues. Rosenthal's next appearances will be pivotal.
@Itslegend380: Is Dallas Keuchel turning it around?
Zinkie: Yes he is. But not to the level he performed last season.
@einstein2u: Do you have any interest in Tim Lincecum?
Zinkie: In a deep mixed league, I could see adding him to your bench or using him in a favorable matchup.
@polandthunder: Should I stash A.J. Reed over Trea Turner? Who will provide more value this season?
Zinkie: I still prefer Turner, even though I think that Reed may be the first one to get a regular role.
@corycarpenter33: When does Tyler Glasnow get called up?
Zinkie: My best guess (and it is only a guess) is that he debuts prior to the All-Star break.
@JustinHarned: Should I rely on Dexter Fowler for the remainder of the year or sell him now?
Zinkie: You can rely on him. The sell-high price would have to be very good for you to trade him.

@BillyLessard27 Do you expect that Joey Gallo will get called up soon?
Zinkie: The Rangers' roster is pretty full. I don't expect a promotion soon.
@PedroAlan: I need saves. Should I add Tony Cingrani, Kelley or Brandon Kintzler?
Zinkie: Take Kelley. He won't permanently solve your problem. But he's the best option for now.
@beisbol268: Should I stash Hyun-Jin Ryu now?
Zinkie: I don't think that you should clear space for him. You can stash him if you have an empty spot.
@DaveYoung312: Should I drop Drew Pomeranz for Doug Fister?
Zinkie: I would stick with Pomeranz. His strikeout rate gives him plenty of value.