Stacking is an integral part of daily fantasy baseball. Correlation drives upside, giving your lineups a slate-winning ceiling when your stacks explode.

This piece will do the digging and the dirty work each day to determine which stacks are worth rostering on FanDuel's main slate. While we want upside, we also need to factor in game theory, especially in a sport as random as baseball.

The MLB DFS heat map at numberFire is a quick way to get a feel for the overall slate and which offenses are in a good spot. You can also check out our daily fantasy baseball projections -- which are powered by numberFire -- to identify the slate's best bats.

Let's look at the top stacks for today's main slate.

MLB DFS Stacks

Cincinnati Reds

Implied Total: 5.60 | Opposing Pitcher: Ty Blach

The Colorado Rockies are getting some career-best ball out of left-hander Ty Blach this year, but it's fair to question how long that will last. The veteran pitcher is somehow performing better at Coors Field to open the year and has a personal best 4.15 ERA through his first eight starts this season. On the back of a low walk rate, he's giving up a 1.41 WHIP rate thus far.

But Blach's success to date doesn't seem particularly sticky. He's striking out just 12.0% of the batters he's facing, and his 4.88 expected ERA implies that he's been a little lucky so far.

A lot of the damage he's doing to opposing lineups is coming against left-handed batters, who have a .158 batting average and a brutal .359 OPS against him. He could struggle against the Cincinnati Reds' platooning lineup, considering opposing right-handers are batting .326 with a .857 OPS against him and that the Reds are drawing walks against left-handed pitchers at the highest rate in the league.

According to our projections, Reds infielder Jeimer Candelario ($3,600) is projected for the fifth-most FanDuel points on the slate tonight at 13.9. He's been on a tear lately with a .872 OPS over the last week and has been giving lefties a hard time all season.

Stuart Fairchild ($3,200) seems like a good value play for Cincinnati stacks. He has a team-high 156 wRC+ against left-handers and is projected to hit leadoff. We have him going for 13.7 FanDuel points, good for second-most on the team. He and Jonathan India ($3,500) rank first and second, respectively, in wOBA against lefties on the Reds, making them solid pieces for DFS stacks tonight.

Elly De La Cruz feels like a riskier play due to his elevated $4,500 salary. We've all seen what he's capable of this season, with 9 home runs, 25 RBI, and 32 stolen bases, but he's also been worse against lefties and has slumped to a .532 OPS over the last month. A date with a so-so pitcher at Coors Field may be what he needs to get back on track, but it could be worth fading him at his lofty salary.

Spencer Steer ($4,000) and Tyler Stephenson ($3,300) have been batting fourth, fifth, or sixth for the Reds for most of the year, and they can put your Reds stacks over the top. They both walk more than 10% of the time against left-handers and each is slugging better than .410 in the split for the season. It doesn't hurt that the Rockies have the worst bullpen in the Majors this season, meaning this game has plenty of routes to getting your Reds stacks on the board today.

Chicago Cubs

Implied Total: 5.55 | Opposing Pitcher: Chris Flexen

The Chicago Cubs have been slumping hard this month. Their .290 wOBA ranks third-worst in the Majors over the last month, and it's led to them going 11-19 since May. While they're still in second place in the division, the Cubs' struggles have caused their odds (+450) to slip behind those of the St. Louis Cardinals (+350) in terms of odds to win the NL Central.

Fortunately, a series with the Chicago White Sox could help them right the ship -- as long as they play, that is, as there could be a chance of weather delays in this one.

With right-hander Chris Flexen and his 5.50 ERA on the mound today, there are plenty of solid options across the Cubs' lineup -- a lineup that is drawing walks against right-handers at the highest rate (10.0%) in the league this year. Mike Tauchman ($3,000) often bats leadoff for the team against righties, and he and Michael Busch ($2,800) rank first and second on the squad in wOBA against right-handers on the year.

Seiya Suzuki ($3,200) and Cody Bellinger ($3,400) are projected for the most FanDuel points on the team today at 13.3 and 13.2 points, respectively. They've each hit a trio of home runs over the last month, though Bellinger's .297 batting average and .475 SLG during that stretch come in significantly higher than Suzuki's marks.

With their recent struggles, the Cubs' salaries are pretty easy to work into DFS lineups. Of their remaining hitters, only Christopher Morel ($3,100) and Ian Happ ($3,200) have salaries exceeding $3,000, while all of Nico Hoerner, Patrick Wisdom, and Dansby Swanson are projected for double-digit FanDuel points.

If we're cherry-picking just one of those value plays, I like Swanson -- in 11 career plate appearances against Flexen, he's recorded a 1.636 OPS with just two strikeouts. He's been struggling to start the season, but his 75th-percentile barrel rate implies he could get back to big numbers eventually.

Colorado Rockies

Implied Total: 4.90 | Opposing Pitcher: Frankie Montas

The Colorado Rockies have a pretty appealing matchup themselves on Tuesday, with Reds right-hander Frankie Montas due for another start.

In addition to the Coors factor, Montas also has some splits that make him worth targeting. The journeyman has fallen flat on the road this year, allowing opposing batters to record a .956 OPS against him when he's away from Cincinnati. Left-handed hitters are also enjoying their meetings with him this year, with a .866 OPS against him on the season.

If you're just looking for the Rockies' top performers, each of Ezequiel Tovar ($3,600), Ryan McMahon ($3,500) and Charlie Blackmon ($3,500) look like fine starts tonight. Tovar and Blackmon lead the team in wOBA over the last month, while Tovar and McMahon pace the Rox in home runs during that stretch with five apiece. All three have been fixtures at the top of the Rockies' lineup this year against righties, making them the go-to options today for any Colorado-based stacks.

Brenton Doyle ($3,700) is projected for 10.9 FanDuel points tonight but has a real chance for a high-scoring game. He has an impressive .957 OPS at home this year and has hit all five of his home runs against right-handers with a .436 SLG against them on the year (second-best on the team). His +560 odds to hit a home run are tied for third-longest in the game's batter props, so it seems like he could be getting slept on heading into tonight's tilt.

Other interesting options include Brendan Rodgers ($2,900) and Elias Diaz ($3,300), who typically hit near the middle of Colorado's batting order against righties, and Elehuris Montero ($3,000), whose +350 odds to hit a home run are the shortest of any hitter in the game despite Montero owns a .312 SLG to date.

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The above author is a FanDuel employee and is not eligible to compete in public daily fantasy contests or place sports betting wagers on FanDuel. The advice provided by the author does not necessarily represent the views of FanDuel. Taking the author's advice will not guarantee a successful outcome. You should use your own judgment when participating in daily fantasy contests or placing sports wagers.