Miami Marlins 2025 MLB Mock Draft 1.0

[Sean McCormack]

Simulating who the Marlins could select with their first six picks in the upcoming draft.

We are now just two months away from the 2025 MLB Draft. Fish On First has already published profiles for many of the prospects worth considering for the Miami Marlins in the first round as well as an updated draft big board. It's time to dive even deeper with a five-round mock draft.

The Marlins will make six selections within the first five rounds—seventh, 43rd, 48th, 78th, 108th and 139th overall. Their overall bonus pool is the largest in franchise history at $15,187,400. Based on the composition of the 2025 draft class and past draft trends, @Hector Rodriguez and I have simulated what the Marlins may do under the leadership of president of baseball operations Peter Bendix and amateur scouting director Frankie Piliere. 

Hector and I alternated picks for this exercise (#7, #48 and #108 selected by me; #43, #78 and #139 selected by him).

 

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First Round (7th overall)—Gavin Fien, 3B, Great Oak HS (CA) 

Big board rank: 10th

Slot value: $7,149,900 

With the seventh pick of the 2025 MLB Draft, the Miami Marlins select third baseman Gavin Fien. The Marlins select one of the most pro-ready high school bats in the draft. 

Gavin Fien is a 6'3", 200-pound third baseman from Great Oak High School in California. Fien is one of the highest-ranked prospects across all outlets with 50-plus grades for all tools. He figures to go much earlier than his brother Dylan, who got an over-slot deal in the seventh from the A's in last year's draft.

Hitting-wise, Fien gets great lift and pull on the ball, hitting for pull-side power and having some of the best exit velocities of any high school prospect in this class. The California native gets scouts excited with his bat speed and advanced hands for his age. He has a unique swing by positioning his hands high, which allows him to stay on plane with the pitcher and hit line drives. The hand placement also allows for Fien to get steep approach on pitches in the lower half of the zone, which he pulls in the air with authority. Overall, he generates high contact rates, has shown the ability to control the strike zone, hunting pitches he likes and using his large frame to turn on a strike. 

In the field, although Fien is athletic enough to play shortstop, he projects as a third baseman at the pro level. He has quick hands, a strong arm, and agile feet. Some scouts believe Fien can also move out to a corner outfield spot eventually. 

The University of Texas commit most likely will be a slight underslot deal. I project Fien to sign somewhere between $6.2M-$6.7M. Similar to what happened last year with their PJ Morlando selection, the Fish would be saving some money to be used for later picks. 

 

Competitive Balance Round A (43rd overall)—Ryan Mitchell, SS, Houston HS (TN)

Big board rank: 43rd

Slot value: $2,276,700

With the 43rd pick of the 2025 MLB Draft, the Miami Marlins select shortstop Ryan Mitchell. The Marlins select one of the most well-rounded high school prospects on the board.

Ryan Mitchell is a 6'0", 175-pound middle infielder out of Houston High School in Germantown, Tennessee. On Perfect Game, Mitchell is the 26th-ranked high school player in the Class of 2025. He's also the top-ranked prospect in the state of Tennessee. 

At the plate, Mitchell has one of the best hit tools in this draft class and terrific plate discipline. He rarely chases pitches out of the zone. He consistently barrels pitches and can hit the ball with authority to all fields. Mitchell has great bat speed and it'll continue to improve as he fills out his frame. Mitchell's power is underrated, but he can drive the ball deep when he swings with lift.

Defensively, Mitchell is a great athlete, but isn't the smoothest player at his position. Mitchell runs a 6.74 60-yard dash and has average to above-average arm strength. If he can keep his speed while adding more solid weight, he could be a quality center fielder. Some scouts view him as an everyday second baseman.

Mitchell is signed to play college baseball for the Georgia Tech Yellow Jackets. He would likely sign for a slot deal. 

 

Second Round (46th overall)—Marcus Phillips, RHP, Tennessee 

Big board rank: 54th

Slot value: $2,128,800

With the 46th pick of the 2025 MLB Draft, the Miami Marlins select right-handed pitcher Marcus Phillips. The Marlins select one of the hardest-throwing college starters in the draft. 

The South Dakota native's fastball sits in the mid-to-high 90s, touching 100 mph with ease. Listed at 6'4", 250 pounds, its easy to understand how he generates so much power. So far this season at Tennessee, Phillips has started 13 games and posted a 10.9 K/9, 3.3 BB/9, and 1.3 HR/9, with a 3.55 ERA and 1.18 WHIP.

His fastball is unorthodox with "cuttery" movement to it. Phillips also throws a slider at 86 mph and a "splinker" as well. Other than his velocity, Phillips' best quality may be the nearly seven feet of extension he gets down the mound, which would rank in the 90th percentile of current MLB pitchers. This make his electric stuff play up even more, leaving hitters with limited time to react. 

With Phillips not turning 21 until two weeks after the draft, I predict that the Marlins would have to give him full slot value. 

 

Third Round (78th overall)—Gavin Turley, OF, Oregon State 

Big board rank: 79th

Slot value: $1,043,700 

With the 78th pick of the 2025 MLB Draft, the Miami Marlins select outfielder Gavin Turley. The Marlins select one of the toolsiest prospects in this draft class. The junior outfielder out of Oregon State has tons of upside, but he is a bit of a project. 

During his collegiate career, Turley has always showcased his power tool, which is one of the best in the nation. He's a plus defender with 60-grade arm strength who'll likely play right field at the next level.

Turley was named to the Freshman All-American second team on Perfect Game in 2023 and the All-Pac-12 first team last season. In his junior season, he is slashing .348/.469/.663 with 63 hits, 13 doubles, 15 home runs, 55 RBIs, 36 walks, and a 1.132 OPS. Turley also has a .403 BABIP and 156 wRC+.

Turley's one weakness is his hit tool and he specifically struggles with offspeed pitches. To his credit, Turley has trimmed his strikeout rate from a 27.3 K% in 2024 to a 21.7 K% in 2025. It helps that he has a 16.9 BB% in his collegiate career.

If the Marlins believe they can fix his swing-and-miss issues, he's worth talking a chance on in the third round. Turley would most likely be signing slightly below slot value at this spot.

 

Fourth Round (108th overall)—Jack Lafflam, RHP, Brophy College Prep HS (AZ)

Big board rank: 69th

Slot value: $708,300 

With the 108th pick of the 2025 MLB Draft, the Miami Marlins select right-handed pitcher Jack Lafflam. Similar to last year's selection of Grant Shepardson in the fifth round, this is where the Marlins invest in a talented prep pitcher. 

Jack Lafflam is a tall glass of water, currently 6'6", 170 pounds at only 18 years old. Topping out in the high 90s and sitting mid-90s on his fastball, Lafflam is one of the harder-throwing prep pitchers in the draft and still has a ton of room to fill out. There have been control concerns, but his stuff and size make up for it.

The Arizona native has a knack for spinning the baseball. Many scouts see untapped potential with his high rpm fastball and slider combined with great extension down the mound. Getting swings-and-misses with ease when he is around the zone, Lafflam has started to move up draft boards due to his extremely high upside.

I project the Marlins to use up earlier savings for an overslot deal at this pick worth $900k-$1.1M, convincing Lafflam to forgo his college commitment to Arizona. 

 

Fifth Round (139th overall)—Kishon Frett, OF, FIU

Big board rank: unranked

Slot value: $523,900

With the 139th pick of the 2025 MLB Draft, the Miami Marlins select outfielder Kishon Frett. The Marlins select one of the top local collegiate prospects in this draft class. To balance out Jack Lafflam's overslot deal in the fourth round, Miami needs to save some dollars. Frett is a fifth-year senior with no eligibility left.

Frett is a 6'3", 215 pound corner outfielder with excellent bat speed and power. At the plate, he does a good job of using his lower half and swings with lots of lift to put the ball in the air.

After three seasons at Seminole State College of Florida, Frett transferred to FIU and has made an instant impact. Frett has been FIU's best power hitter for the past two seasons.

During his FIU Panthers career, Frett has played in 100 games and started in 97. Frett is slashing .287/.411/.642 with 97 hits, 35 home runs, 76 RBIs, 40 walks, 92 runs scored, and a 1.053 OPS.

The Broward County native could be a nice option for the Marlins.  

 

Summarizing Rounds 1-5

Our selections of Gavin Fien, Ryan Mitchell, Marcus Phillips, Gavin Turley, Jack Lafflam, and Kishon Frett add a blend of prep hitting, prep pitching, college hitting, and college pitching to the Marlins farm system. The team would be left with roughly $2-3 million in bonus pool money for the remaining 15 rounds. 

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[1993 fan from start]

mock draft 1.0

first round Kyson Witherspoon, RHP, Oklahom      round A . RJ Austin (CF, Vanderbilt)  second round   Marcus Phillips ,Rhp Tennessee  Third Round   Gavin Turley of, Oregon State    Fourth Round Jack  Lafflam Rhp, Brophy College Prep HS (AZ )   fith round John Stuetzer (HS SS/CF) Round 6  Grant Jay – C – Dallas Baptist Patriots 

worth a look Diego Velazquez – SS,3B  at right pick

 

[Chad Turner]

I'd take that!