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

Arizona Diamondbacks

Implied Total: 5.04 | Opposing Pitcher: Jose Suarez

Los Angeles Angels lefty Jose Suarez is not having his finest season. He has pitched to a 6.54 ERA on the year, backed up by a 4.72 FIP, a 4.15 expected ERA, and a 1.67 WHIP.

He's striking out opposing batters at a solid career-best 23% rate but is also walking them at a 13.5% rate while allowing his opponents to record a .844 OPS.

He has limited the overall damage teams are doing against him by giving up fly balls on under 20% of balls put in play, but his career marks and style put him at risk for meltdowns in any given start.

That makes me want to stack some Arizona Diamondbacks in tonight's tilt. The Diamondbacks have been the fourth-most effective team in the league against lefties on the year according to wRC+. Ketel Marte in particular has 10 homers and a .732 SLG against left-handers, making him an exciting option tonight. He has a $3,600 salary and is projected for 13.2 FanDuel points.

While Marte has been the team's most effective weapon against lefties on the year, Christian Walker ($3,300) is the highest projected Diamondback for the night according to numberFire. He's slated for a whopping 14.8 FanDuel points, the fifth-most of any player on the slate, making him a strong value play even at his salary.

Speaking of value, Randal Grichuk is projected for 11.4 FanDuel points despite a discounted $2,400 salary, making him the fourth-best value on the slate per numberFire. He hasn't been playing much lately due to the number of righties Arizona has faced on the schedule but should make the lineup tonight against a lefty.

Lourdes Gurriel ($3,200) could be worth an add tonight, considering he is projected for 12.2 FanDuel points. Eugenio Suarez ($2,700) could break out of his slump tonight -- in 13 career plate appearances against Jose Suarez he has hit for a .333 average with a .968 OPS and just 2 strikeouts.

Blaze Alexander could be a solid lower-salaried option at $2,600 tonight. He's projected for 8.0 FanDuel points but is batting .350 with a .533 SLG against left-handers on the year. He isn't getting everyday playing time yet so you'll want to make sure he's in Arizona's lineup before adding him to your DFS lineups, but I like his prospects in this one if he starts.

Philadelphia Phillies

Implied Total: 4.39 | Opposing Pitcher: Kutter Crawford

The Boston Red Sox have gotten some pretty strong pitching from their underdog band of starters this year, but it looks like the league might be figuring them out. After recording the best team-wide ERA (2.62) in baseball in March and April, the Sox posted a 4.12 ERA mark in May and a 4.31 ERA over the last 30 days.

That overall team trajectory certainly applies to Kutter Crawford, who has given up 15 earned runs in his last three starts and at least one home run in each of his last four. His sterling 1.35 ERA from March and April has spiked to over 5.00 in his games since May. That's not the way you want things to be trending as you prepare to take on the Philadelphia Phillies, whose 5.11 runs per game rank second-best in baseball.

Bryce Harper's 14.5-point projection is the seventh-highest on the slate, but his $3,900 salary reflects his immense upside against the Sox today. He's been on fire lately, with a 1.248 OPS over the last week. His +340 odds to hit a home run rank second-shortest in the game, trailing only Kyle Schwarber's +265 odds.

Like Harper, Schwarber is projected for a solid outing (13.4 FanDuel points) but carries a steep salary ($4,100). He could well be worth building your roster around if you like his chances of hitting a home run here, but it's fair to point out that he's batting just .170 with a .326 SLG against righties this year. As high as his upside is, he might be worth leaving off your Phillies stacks in favor of more consistent scorers.

If you're chasing power, Nick Castellanos has recorded similar numbers to Schwarber against righties in a slow season and has a much more reasonable $2,900 salary.

The rest of the Phillies' lineup seems like a fantastic unit to stack. Bryson Stott is projected for 12.3 FanDuel points and has a $3,100 salary. He's walking just about as often as he's striking out, and he's a threat to steal bases once he makes it out there. He and Alec Bohm ($3,300) have been having impactful seasons so far and have a strong potential to stack up for FanDuel points tonight -- they have a combined 83 RBI on the season and bat around each other in the order.

J.T. Realmuto has a $3,000 salary today and is projected for 12.1 FanDuel points, making him a decent value play in a Phillies stack, while Edmundo Sosa ($2,900) is playing some impressive ball lately and is projected for 10.0 FanDuel points himself. He has a .890 OPS on the year and leads the National League in triples (4), so he could be a great way to cap off your stacks today.

San Francisco Giants

Implied Total: 3.75 | Opposing Pitcher: Ronel Blanco

Is it just me, or has Ronel Blanco looked a bit different since returning from his 10-game sticky substance suspension? The Houston Astros righty was one of the hottest pitchers in the league to open the year up but has stumbled to a 4.67 ERA across 17.1 innings since returning to the lineup.

He's pitched against some underwhelming competition in those innings as well, including outings against the Oakland Athletics, the Minnesota Twins, and the St. Louis Cardinals, who rank 29th, 16th, and 24th in runs per game this year respectively. Given the .201 BABIP (fourth-lowest) opposing batters have had against him on the year, it seems like luck might be swinging back away from him.

On the flip side, the San Francisco Giants are trending up lately. They've scored the fifth-most runs in baseball over the last month with the eighth-best wRC+ as a team in that span. They've stopped striking out, doing so at the sixth-lowest rate in the Majors over the last month while drawing walks at the third-highest rate.

They're a team on the rise catching a starting pitcher who looks like he's starting to slip, meaning the Giants have a lot of interesting value plays to offer today.

That starts with Matt Chapman ($2,900), who could be the best value on the slate if he plays. Chapman missed the last two games with a minor hamstring issue, but Giants manager Bob Melvin said he expects him to suit up against the Astros tonight. numberFire projects him for a strong 14.3 FanDuel points in this one.

Wilmer Flores ($2,600) falls into the same boat, missing the last game with a sore knee. He's also expected to return and has hit three home runs in his last four starts. He's only projected for 8.7 FanDuel points after a slow start to the year, but he seems to be finding his stride lately with a .892 OPS over the last two weeks.

Heliot Ramos ($3,500) has emerged as a breakout for the Giants lately and is projected for 10.2 FanDuel points here. He's been hitting near the top of the lineup lately and has a .932 OPS on the year. He's also the only Giants batter with a salary over the $3,000 line, making it easy to splurge on his salary while still stacking up your other Bay Area favorites.

Other solid value plays include Mike Yastrzemski ($2,700), Michael Conforto ($2,900), Thairo Estrada ($2,800) and Jorge Soler ($2,700), each of whom bring a solid amount of power to the plate.

If you're just looking for a chance at a homer, Soler's +450 odds to hit a home run are the shortest on the team. According to MLB's StatCast data Soler has the 33rd-largest disparity between his actual SLG and his expected SLG rate on the year (-0.05), which could be a sign of an impending turnaround after a slow start to the season. Soler hit 37 home runs just last season, so we know there's real power there just waiting to surface again this year.

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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.