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

Philadelphia Phillies

Implied Total: 4.99 | Opposing Pitcher: Trevor Rogers (L)

The Philadelphia Phillies have the slate's highest implied total (4.99) against the Miami Marlins and southpaw Trevor Rogers. Considering Philly sports the sixth-highest wRC+ against left-handed pitchers, they figure to be a chalky stack tonight.

Through 15 starts, Rogers owns a 4.90 ERA -- backed up by a 5.10 xERA, 4.41 xFIP, and 4.62 SIERA. He does a good job keeping the ball on the ground (48% GB%) but is otherwise a hitter-friendly arm.

Rogers doesn't generate many whiffs (9.4% SwStr%) nor does he strike out many batters (17.6% K%). Per Statcast, he's in just the 33rd percentile in barrel rate (8.6%) and 13th percentile in hard-hit rate (44.5%) allowed. That's played a role in him surrendering a .353 wOBA and .392 expected wOBA on contact.

Any Phillies stack starts with at least one of Bryce Harper ($4,000), Kyle Schwarber ($3,800), or Trea Turner ($3,500). You can't go wrong with any of the three. Harper (.425 wOBA; 178 wRC+) and Schwarber (.434 wOBA; 184 wRC+) have downright gaudy numbers against lefties, but Turner (.378 wOBA; 146 wRC+) isn't too shabby himself. Harper has been especially hot this month, sporting a 1.197 OPS and blasting seven home runs in June.

Personally, I'm not prioritizing Alec Bohm ($3,300) today considering his so-so lefty splits (.310 wOBA; 100 wRC+). Both Bryson Stott ($2,800) and Nick Castellanos ($2,700) offer similar numbers against southpaws at a lower salary. Notably, Castellanos has poked out 6 of his 11 home runs against left-handed pitchers. He has +390 odds to hit a home run on FanDuel Sportsbook, second in this game behind only Schwarber (+330).

The rest of Philadelphia's lineup isn't as set in stone. But, if Edmundo Sosa ($2,600) starts, he'd be an intriguing low-salary option to round out this Phillies stack. It's a small sample, but Sosa has a blistering .449 wOBA against lefties. He also has 14 steals -- notable considering Miami's allowed the seventh-most steals per game (0.81).

New York Yankees

Implied Total: 4.5 | Opposing Pitcher: Jose Berrios (R)

The New York Yankees sport baseball's highest wOBA (.339) and wRC+ (123) against right-handed pitchers. With Jose Berrios on the bump for the Toronto Blue Jays, the Bronx Bombers are an obvious stacking candidate.

After a blistering opening month for Berrios, regression has hit him hard. He's pitched to a 5.06 ERA since May 1st while letting up 12 earned runs and six home runs over just his last three outings.

That's more in line with his ERA indicators. Across 16 starts, Berrios has a 4.77 xERA, 4.34 xFIP, and 4.36 SIERA -- all significantly higher than his 3.43 ERA.

Berrios isn't getting many whiffs (8.0% SwStr%) or strikeouts (17.5% K%). He's kept his WHIP at 1.13, but a .257 BABIP is still lower than you'd expect for someone with a 43.2% GB%.

That bodes well for the Yankees lineup, especially Aaron Judge ($4,800). Judge is the highest-salaried hitter on today's main slate, but I'd be hard-pressed to build around New York without him. His righty splits (.468 wOBA; 211 wRC+) are eye-popping, and he's been on an absolute tear the last two months. In 49 games since May 1st, Judge has a 1.412 OPS with 24 home runs.

Juan Soto ($4,400) isn't far off Judge. He has an OPS north of 1.000 against righties, compiling a .431 wOBA and 186 wRC+ in the split. Soto has +330 odds to hit a home run, and 15 of his 19 yabos have come in this split.

As of Thursday afternoon, Soto is our highest-projected hitter. Our projections peg him for 15.8 FanDuel points.

Anthony Volpe ($3,200) and Alex Verdugo ($3,000) are capable mid-range options. Verdugo (.321 wOBA; 111 wRC+) has been slightly better than Volpe (.319 wOBA; 109 wRC+) against righties, though the latter offers more counting stats from the leadoff spot. Volpe has the 10th-most runs scored in baseball and boasts -145 odds to record a run tonight.

I'm staying away from Gleyber Torres ($2,800) given his 2024 struggles, but Jose Trevino ($2,600), Ben Rice ($2,400) and DJ LeMahieu ($2,400) all offer upside at low salaries. Rice (.388 wOBA; 156 wRC+) has stellar right-handed splits in a small sample, and Trevino (.315 wOBA; 106 wRC+) hasn't been bad himself.

LeMahieu has been brutal against righties, but he a .802 OPS across 28 career plate appearances versus Berrios.

Baltimore Orioles

Implied Total: 4.37 | Opposing Pitcher: Jon Gray (R)

This wouldn't be a particularly good stacking article if I didn't tout the Baltimore Orioles. Though Baltimore has dropped five of their last six games, they still have the fourth-best record in baseball and boast the third-best wRC+ (118) against righties. They host Jon Gray and the Texas Rangers tonight.

Gray's been solid at face value, pitching to a 3.03 ERA through 71 1/3 innings. But his ERA indicators (4.31 xERA, 3.68 xFIP, and 3.79 SIERA) -- while mostly solid -- aren't nearly as impressive as his ERA.

The righty has generated whiffs (12.6% SwStr%) and strikeouts (22.7% K rate) at a decent clip, but his quality of contact metrics leave a lot to be desired. Gray is in the 28th percentile for barrel rate (9.0%), 18th percentile for hard-hit rate (43.4%), and 7th percentile for average exit velocity (90.9 mph) allowed.

That explains his gaudy .400 expected wOBA on contact and opens the door for a strong offensive showing from Baltimore.

Gunnar Henderson ($4,600) is the headliner for the O's. In the midst of a breakout season, Henderson (.428 wOBA; 184 wRC+) has been particularly effective against righties. He's blasted 21 of his 26 homers in the split and sports +390 odds to hit a home run today.

Baltimore isn't short on viable mid-range options. Anthony Santander ($3,600) and Adley Rutschman ($3,500) are enjoying their best months of the season, posting a .958 OPS and .848 OPS, respectively. Neither Santander (.323 wOBA; 112 wRC+) nor Rutschman (.301 wOBA; 97 wRC+) have been especially impressive against righties -- something Jordan Westburg ($3,400) can't say.

In this split, Westburg trails only Henderson on the O's in wOBA (.390), OPS (.908), and wRC+ (158).

Ryan Mountcastle ($3,200) and Ryan O'Hearn ($3,000) are more than viable options, too. Both are flirting with a .200 ISO against right-handed pitchers, with O'Hearn's .364 wOBA particularly standing out.

We project O'Hearn for 12.6 FanDuel points, making him the sixth-best point-per-dollar value on the slate (4.2 FanDuel points per $1,000).

The rest of Baltimore's lineup is less certain. Wait for an official announcement, but Colton Cowser ($2,700) and Ramon Urias ($2,300) are the two low-salary names I'm eyeing. They each have at least a .730 OPS against righties while Cowser has cranked 7 of his 10 home runs in that split.

The last guy I'd consider for Baltimore is Heston Kjerstad ($2,400). MLB Pipeline's 20th-ranked prospect hasn't found much success in the majors yet, but his minor-league splits offer upside. Against righties, Kjerstad registered a 1.083 OPS at Triple-A.

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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.