Top-10 Fantasy Baseball First Basemen for 2025: Vladimir Guerrero Jr., Freddie Freeman, Josh Naylor, Pete Alonso, Vinnie Pasquantino and More

We’re getting closer and closer to wrapping up my fantasy baseball series where I rank my top-10 fantasy players at each position.

Let’s discuss my top fantasy first basemen next. We’ve already discussed closers, designated hitters, second basemen, shortstops, outfielders, catchers and starting pitchers.

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1. Vladimir Guerrero Jr.

Guerrero was the top fantasy first baseman in 2024, and I think he finishes there again in 2025.

He hit .323 last season, but even if he regresses closer to his .288 average, I think Guerrero will provide enough pop and run production to finish atop the position again.

Guerrero is still just 25 years old, so I think there’s still room for growth in his game. If he is dealt out of Toronto during the season, Guerrero’s fantasy value should only go up.

2. Freddie Freeman

Freeman was the No. 2 finisher in 2024, and that was after missing 15 games. He’s 35 years old, but still has probably an elite season or two in his bat.

Even with his average dropping way down last season, Freeman got on base at a .378 clip and had enough power and run production to finish second at the position.

He could regress a bit more this season, but if he gets in a full season, he should challenge Guerrero and others for the top fantasy 1B spot.

3. Bryce Harper

Harper is another player who could contend for the top fantasy spot if he can get a full season in. 

In 145 games last season, Harper had a .285 average and .373 OBP, along with 30 home runs and 87 RBIs. It was nice to see Harper get in close to a full season, because he failed to top 130 games in the previous two years.

He’s 32 years old, so while his career might be on the back nine now, Harper still has plenty left in the tank, and should provide plenty of fantasy production after being a highly sought-after draft pick.

4. Matt Olson

Olson was one of the biggest busts of the 2024 season, but he still played in 162 games and was a top-10 finisher at the position. I think he will improve this season.

He hit just .247 last season, and that’s pretty on par with his career .254 average. Olson’s OBP dropped from .389 in 2023 to just .333 in 2024. If he gets that back closer to his .349 career mark, he should be in store for a much better fantasy campaign.

His power numbers also dried up (54 homers, 139 RBIs in 2023 to 29 homers, 98 RBIs last season). I expect him back in the mid-30s for homers and over 100 RBIs. He’s played full seasons in three straight years, and that, along with a little improvement, should help him get back on track (and maybe contend for the top fantasy 1B spot again).

5. Josh Naylor

Naylor was the No. 3 fantasy finisher at 1B in 2024. In the offseason, he got dealt to the Diamondbacks, which I think is a great thing for his fantasy value.

He hit just .243 last season, but got on base at a .320 clip, which is right on line with his career mark. The big change in his stats, aside from the dropoff in average, was a 14-homer and 11-RBI increase.

Naylor should hit in the heart of Arizona’s lineup, where he’ll follow some good/great hitters. Naylor could contend for the top spot at the position and be a big-time fantasy draft steal if he posts an average closer to his .262 career mark.

6. Pete Alonso

Alonso hasn’t signed with a team yet, but I expect him to join a contender, and really, he should produce decent numbers regardless of where he ends up.

In a full 162-game season in 2024, Alonso had a .240 average and .329 OBP. He popped 34 home runs and drove in 88 runs. His power numbers were down from the previous two seasons, but an increased average and OBP helped Alonso be a solid fantasy asset.

His average draft position will probably move a little (up or down) after Alonso signs with a team. Ideally, he joins a lineup that isn’t so stacked, and that way, his ADP wouldn’t likely rise too much.

7. Christian Walker

Walker was the D-Backs’ first baseman, but now is with the Astros. Houston lost a few big bats this offseason, but I still like this landing spot for Walker.

In 130 games last season, Walker had a .251 average and .335 OBP. He hit 26 home runs and drove in 84 runs. I think those numbers would be a welcomed sight for the fantasy owners who draft him this season.

I also think it’s possible that Walker outperforms those marks, especially if he gets in a full season. He could become a draft steal and a much higher fantasy finisher if all things click in Houston.

8. Luis Arraez

Arraez got a nice fantasy boost last season when Miami traded him to San Diego. Of course, Arraez’s numbers improved after the trade, yet I still think he’s a bit undervalued going into 2025.

Across 117 games with the Padres, Arraez had a .318 average and .346 OBP, along with four home runs and 41 RBIs. He’s a rare contact hitter in today’s power-driven MLB, but he’s got plenty of fantasy value with all his hits, a few stolen bases and not many strikeouts.

He is expected to hit atop the Padres’ lineup, and if he gets on base as much as he did last year, Arraez is going to score a ton of runs. He also probably has position eligibility at second base, so that’s a nice little bonus with Arraez.

9. Vinnie Pasquantino

Pasquantino had a breakout season in 2024, but really he just got in close to a full season, and it led to a nice overall fantasy showing.

In 131 games, Pasquantino had a .262 average and .315 OBP, along with 19 home runs and a whopping 97 RBIs. He’s 27 years old, and I think it’s reasonable to expect some improvement from him, which will most likely come in his home run numbers.

I’m fine taking Pasquantino as a starting first baseman, but I’d also want to have a decent backup in place in case he cannot get through the season. I think Pasquantino will be a pleasant surprise to the fantasy owners who end up with him though.

10. Yandy Diaz

Diaz regressed in a big way in 2024, which makes him a bounceback candidate for 2025.

His average dropped 49 points, and his OBP was down 69 points. Diaz’s career marks are about eight points higher in average and 32 points higher for OBP.

I think Diaz is in for a better showing in 2025. I don’t think he’ll be a top-five finisher at the position, like he was in 2023, but a bounceback season could mean a top-10 finish. The nice thing about his down 2024 season is that his draft stock is low going into the season - I like taking advantage of that, but also having a backup plan in place in case last year was the start of his downfall as a hitter.

Honorable Mentions

There’s several players who I considered for my top-10 list, especially as we neared No. 10.

Some of the players closest to making my top-10 were: Triston Casas, Jake Burger and Paul Goldschmidt.

Some other names to keep in mind are: Colt Keith, Ryan Mountcastle, Nathaniel Lowe, Spencer Horwitz, Carlos Santana, Nolan Schanuel and Andrew Vaughn.