Top 10 Impactful MLB Trades for the Second Half: Padres, Astros, Yankees, Blue Jays, Mariners, Mets

The Padres shook the industry, the Astros reunited with a franchise icon, and in New York, New York, the relief market was ultra competitive. 

But which were the trades that could provide a jolt in the second half as hopeful contenders prepare for pennant races? Here are the 10 most impactful moves for the stretch run:

10. 1B Ryan OHearn, OF Ramon Laureano : Baltimore Orioles to San Diego Padres

The headline-grabbing move in a bustling trade deadline day for the Padres was the addition of Mason Miller, but addressing some of their biggest question marks at DH and left field was a huge success for San Diego. A.J. Preller landed Laureano, whos enjoying the best season of his career, and OHearn, a pure rental piece, from the Orioles for six prospects, which was just one of his five deals that involved a total of 22 players ahead of the deadline. While OHearn can slot in at both DH and first base, Laureano figures to be the Padres everyday left fielder now and in 2026, when he has a team-friendly $6.5 million club option. Both OHearn and Laureano provide necessary upgrades in San Diegos lineup. 

9. 3B Ryan McMahon: Colorado Rockies to New York Yankees

Any concern about McMahons ugly road numbers is already a distant memory. It turns out plucking a player from the hopelessly uncompetitive environment of Colorado and putting him in pinstripes in a pennant race in the Bronx can bring out the best in McMahon. He already notched his first walk-off since being traded to the Yankees, and even though its a small sample size, hes hitting .400 with a 1.020 OPS, four walks and four RBI in 25 plate appearances with New York. The Yankees primarily added McMahon for his excellent defense at the hot corner, but his presence at the plate has been a welcome addition to their lineup depth. 

8. RHP Shane Bieber: Cleveland Guardians to Toronto Blue Jays

This was the best under-the-radar deal of the trade deadline. Its a risky move that could pay off in a huge way for a Blue Jays rotation that needed an ace to take Game 1 in the postseason. The risk is that Bieber hasnt pitched since April 2024, before he underwent Tommy John surgery, and he suffered a setback after a June rehab outing. But Biebers ceiling is Cy-Young level dominance, and if he can return to that light-out version of himself, then Torontos starting pitching staff is set for October.

7. 1B Josh Naylor: Arizona Diamondbacks to Seattle Mariners

This move might not get the attention it deserves after Seattles blockbuster deal for Eugenio Suarez, but this was a significant and necessary upgrade for the Mariners that addressed their corner infield in a splashy way. Naylors 120 OPS+ brings consistent production to a strong lineup that has surprisingly maintained its position as a top five offense in baseball. Plus, Naylor is feisty! That edgy attitude makes a difference in October (who can forget the slugger calling Gerrit Cole his daddy?!). This was an excellent deal in multiple ways for the M's.

6. Closer Ryan Helsley : St. Louis Cardinals to New York Mets

While I knew the Mets aimed to bolster their bullpen before the deadline, the aggressiveness David Stearns showed surprised me. It looked like the Mets did enough with their acquisition of right-handed submariner Tyler Rogers (1.80 ERA) from the Giants. But then came the eyebrow-raising deal for Helsley. Though this bullpen isnt Padres-level scary (more on that later), the Mets now have a formidable pair of arms behind closer Edwin Diaz and a dynamic relief unit that should befuddle opposing hitters. 

5. 3B Carlos Correa: Minnesota Twins to Houston Astros

Though I'm skeptical that this was actually the best, most impactful roster decision for the Astros, particularly considering Correas injury history and because hes not having a good year, reuniting with their championship winner offers a nostalgic bonus and excitement within the clubhouse. No matter how you slice it, this was a special, meaningful deal. It can mean even more if Correa taps into his performance from last year (.905 OPS in 86 games) down the stretch for the first-place Astros.  

4. Closer David Bednar : Pittsburgh Pirates to New York Yankees

Brian Cashman was not going to walk away from this years trade deadline without landing a high-leverage reliever, and not only did he finally find his man in Bednar, but he was able to pull off a deal for San Francisco Giants closer Camilo Doval, too. But Bednar, who required a high prospect price and wasnt easy to wrangle away from Pittsburgh, is the Yankees biggest acquisition of the summer. He bolsters a bullpen thats led by Devin Williams and Luke Weaver, and now the Bronx Bombers, with a healthy Aaron Judge, have no excuse not to win in October.

3. Closer Mason Miller: Athletics to San Diego Padres

Hats off to A.J. Preller for yet another stunning trade deadline. When he traded for Miller, many industry analysts expected Padres closer Robert Suarez to be moved. Instead, San Diego will combine Miller with Suarez to create the best 1-2 punch in baseball at the backend of a bullpen. According to Statcast, Miller has thrown the second-most pitches at or above 100 mph (Jhoan Duran is first) in the major leagues. Pairing him with Suarez, who leads the majors with 30 saves, and the rest of the Padres terrifying relief corps, will be a nightmare for hitters. Now add that bullpen to the rest of their improved roster and San Diego looks primed for a deep playoff run. 

2. Closer Jhoan Dur�n: Minnesota Twins to Philadelphia Phillies

The best available reliever went to the team that most desperately needed a closer. We love to see it. The Phillies, for years, have needed a trade-deadline acquisition like Duran, so kudos to Dave Domebrowski for finally pulling it off in a year that the Phillies are facing a ton of pressure to win. Duran has a 2.01 ERA this season, and hes converted 74 saves in 83 chances spanning across the past four seasons. And, as a bonus, hes only 27 years old and is under team control through the 2027 season. The flamethrower was undoubtedly the Phillies missing piece.

1. 3B Eugenio Su�rez: Arizona Diamondbacks to Seattle Mariners

Man, am I excited to see what Suarez and Cal Raleigh can do together. Suarez joins Seattle with 36 home runs, while Raleigh already has 42 (the most in MLB). So theres no doubt that the Mariners slugging catcher will eclipse 50 homers, and Suarez looks primed to get there, too. They have the chance to become the first duo of hitters to each record 50 homers in a single season since 1961 (Mickey Mantle and Roger Maris for the Yankees). On top of that, the Mariners were such big winners at the deadline that they could win the AL West for the first time since 2001. Buckle up for an electric stretch run.

Honorable mentions:

• Camilo Doval, RHP reliever, New York Yankees
• Tyler Rogers, RHP reliever, New York Mets
• Griffin Jax, RHP reliever, Tampa Bay Rays
• Harrison Bader, OF, Philadelphia Phillies
• Merrill Kelly, RHP, Texas Rangers
• Cedric Mullins, OF, New York Mets

Deesha Thosar is an MLB writer for FOX Sports. She previously covered the Mets as a beat reporter for the New York Daily News. The daughter of Indian immigrants, Deesha grew up on Long Island and now lives in Queens. Follow her on Twitter at  @DeeshaThosar .