Underowned Fantasy Baseball Hitters You Should Add Today

I just went over some fantasy baseball waiver wire targets for a second time already this week. Here, I want to look through some pages here to identify some under-rostered fantasy hitters to look into adding as the MLB regular season opens.

Some hitters will be owned in most leagues, but I'm still going to mention them if their own percentage isn't where I think it should be, or will be soon. I'll at least pick out one player at each position.

Fantasy baseball waiver wire options can be found all season on FantasySP!

Alejandro Kirk - Catcher

Toronto's Kirk is underowned in my eyes. He's sitting near 72% right now.

Kirk had a .282 average and .348 on-base percentage a year ago, and is part of a stacked lineup again for 2026. He's not a huge power threat, but 18 doubles and 15 homers are good marks. Kirk had 76 RBIs, 45 runs scored, 48 walks and just 59 strikeouts. 

I see another big season in store for the Toronto catcher, who is just 27 years old, so he's nearing his prime. You'll still likely need another catcher, as he doesn't play every day, but Kirk could be your lead fantasy catcher.

Consider adding him, especially if your catching situation isn't the best.

Jonathan Aranda and Luis Arraez - First Base

Tampa Bay's Aranda and San Francisco's Arraez are two underowned first basemen in my eyes. Aranda is rostered in 64% of leagues, while Arraez is at 83%.

Aranda posted a .316 average and .393 OBP over 106 games last year. It was a breakout showing for him, and in a full season in 2026, I expect more from him.

I see Aranda emerging as a big-time fantasy asset this year, so scooping him up now could pay off huge in the long run.

Arraez is on a new team again after signing with the Giants this offseason. He's expected to hit leadoff and play every day at second base.

He's a contact hitter, posting a .292 average and .327 OBP over 154 games last year. Arraez had 181 hits, but just eight homers. He did leg out 30 doubles, and also had 61 RBIs, 66 runs scored, 11 stolen bases, 34 walks and just 21 strikeouts.

Arraez is an overlooked fantasy asset most years, and he is again for 2026. Get him on your roster and you'll see what I mean in short order.

Jorge Polanco - Second Base

Polanco catches my eye at second base the most. He's owned in 72% of fantasy leagues.

He's projected to hit cleanup and play second every day for the Mets. Polanco is projected to hit after Francisco Lindor, Juan Soto and Bo Bichette, so there's plenty of fantasy value in being the cleanup hitter.

In 138 games last year, he posted a .265 average and .326 OBP. He had 125 hits (30 doubles and 26 homers), plus 78 RBIs, 64 runs scored, six stolen bases, 42 walks and 82 strikeouts.

He's not a high-end fantasy hitter, but he will probably be worth rostering in more leagues because of his role. Add him now and it could pay off in a big way down the line, especially at a weaker fantasy spot.

Carlos Correa - Shortstop

Correa is a shortstop who I think is underowned right now. He's sitting around 50% owned.

Correa is back in Houston and in a great fantasy spot, projected to play daily at third base and hit cleanup. Yes, that means he will have dual position eligibility (at shortstop and third base).

In 144 games between stops in Minnesota and Houston last year, Correa had a .276 average and .332 OBP. He posted 148 hits, including 29 doubles and 13 homers. Correa also had 52 RBIs, 63 runs scored, 45 walks and 113 strikeouts.

When healthy, he can be a high-end fantasy hitter. Add and utilize him while he's active, and enjoy his dual position eligibility.

Sal Stewart - Third Base

There aren't many third basemen that catch my eye, so I'll highlight Stewart. He's owned in about 62% of leagues.

He's projected to hit cleanup and play first base for an improved Reds' lineup. Stewart will be another guy with dual position eligibility (at first and third), so that's something to take advantage of.

Stewart has only played 18 MLB games, so maybe that plays into his lower percentage. If he sticks in the big leagues and is delivering from the cleanup spot, Stewart should be a great fantasy asset. Consider adding him now and beating the rush of people who will target him if he excels early on.

Jakob Marsee and Daylen Lile - Outfield

Marsee and Lile are two young outfielders who are underowned right now. Marsee sits at 91%, while Lile is at 65%.

Marsee is projected to play center field and start every day for the Marlins. It's not a great lineup in Miami, but Marsee could still deliver enough for fantasy relevance again.

In 55 games last year, Marsee had a .292 average and .363 OBP. He had 61 hits, including 18 doubles, three triples and five homers. Marsee added 33 RBIs, 28 runs scored, 14 stolen bases, 22 walks and 48 strikeouts.

He could become a big fantasy asset in his first full season. Marsee is owned in most leagues already, but could be at 100% and stick there all year, so get it done now before it's too late.

Lile is projected to play right field and hit fourth in a young and talented Washington lineup. Any cleanup hitter has a good fantasy outlook, and Lile could shine again after a brief MLB showing in 2025.

In 91 games, Lile had a .299 average and .347 OBP. He had 96 hits, including 15 doubles, 11 triples and nine homers, plus 41 RBIs, 51 runs scored, eight stolen bases, 21 walks and 56 strikeouts.

Lile was a good asset in 2025, and I think he excels again in 2026, maybe even improving. His own percentage should shoot up in a hurry, so consider adding him now