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Down 2-1 in the ALCS, the Astros are turning to former Cy Young winner Zack Greinke for Game 4 at 8:08 p.m. ET. The veteran has thrown just 3.1 innings over the last month and has historically struggled against Red Sox hitters. Boston's roster is hitting .341 off him across 98 ABs, so the Sox aren't fretting about Greinke's turn in the rotation. Enrique Hernandez, J.D. Martinez and Hunter Renfroe all have multiple homers off Greinke and will be highly coveted MLB DFS picks.

But are there some undervalued options in the Red Sox' batting order that should make their way into your MLB DFS lineups? And which Astros should you roster against Boston probable Nick Pivetta (9-8, 4.53)? Before making any postseason MLB DFS picks, be sure to check out the MLB DFS advice, strategy and projections from SportsLine daily Fantasy expert Mike McClure.

McClure is a daily Fantasy pro who has won almost $2 million in his career. And when it comes to daily Fantasy baseball, McClure is at his best. Recognized in the book "Fantasy Football (and Baseball) for Smart People: How to Turn Your Hobby into a Fortune" as a top MLB DFS player, McClure's proprietary projection model simulates each game 10,000 times, taking factors such as matchups and recent results into account. This allows him to find the best values on every site.

On Monday, McClure listed Red Sox 1B/OF Kyle Schwarber among his top MLB DFS picks on FanDuel and DraftKings. The result: Schwarber hit Boston's third grand slam of the ALCS as he returned 20 points on DraftKings and 29.2 points on FanDuel. Anybody that included him in their lineups was well on the way to a profitable day.

Now, with the MLB playoffs 2021 continuing on Tuesday, October 19, McClure has locked in his top MLB daily Fantasy picks. Head to SportsLine now to see them

McClure's top MLB DFS picks for Tuesday, October 19

One of McClure's top MLB DFS picks for Tuesday is keeping Schwarber in your lineups at $3,100 on FanDuel and $5,000 on DraftKings. After hitting seven home runs in 41 games for Boston during the regular season, Schwarber already has three home runs through just eight postseason games with the Red Sox.

Schwarber has a good chance to add to that total with a righty on the mound tonight. Of Schwarber's 32 home runs this season, 28 came against right-handed pitchers. Also, Greinke has had a rough last month which included a stint on the injured list and he's thrown just one inning this postseason. The former Cy Young winner has a 12.00 ERA in three innings versus Boston this year and Schwarber is ready to tee off him.

Another key in McClure's optimal MLB DFS strategy includes rostering Dodgers shortstop Corey Seager ($4,800 on DraftKings, $3,700 on FanDuel). Seager hit a two-run homer in Game 2 and his last three hits this postseason have gone for extra bases.

Seager has reached base safely in 19 straight games dating back to the regular season and he's always shown a great eye against RHPs. That's good news with veteran Charlie Morton on the mound as Seager posted a .404 on-base percentage against RHPs in the regular season. The afternoon start also favors Seager in this matchup as Morton's ERA was 1.03 runs higher in day games than night games. Everything is lining up for Seager to produce a huge game so you should confidently slot him into MLB DFS lineups.

How to set your MLB DFS lineups for Tuesday, October 19

McClure is also targeting an undervalued player who is set to explode for huge numbers on Tuesday. The stars are aligning for him to return tournament-winning value and he comes at a price that won't break the bank. You can only see who it is here.

So what are the top MLB DFS picks for Tuesday, October 19? Visit SportsLine now to see DFS millionaire Mike McClure's complete player pool and picks for FanDuel and DraftKings, and cash in big on MLB DFS.