Buy Low, Sell High Fantasy Baseball Trade Advice for Week 4 (2026)

April 21, 2026

Joey's fantasy baseball buy low, sell high trade advice for Week 4 of 2026. His undervalued fantasy baseball trade targets and overvalued players to trade away.

Welcome, RotoBallers, to our weekly buy/sell fantasy baseball trades advice article for Week 4 of the 2026 season, highlighting the best players to trade for and trade away. Every week of the fantasy baseball season, we will dive into the best players to target in trade talks and the top players to move off of. 

In this week's edition, we'll look at five players to discuss in trades. The first three players on this list are currently buy-low options. Each of these players has not performed well recently and has seen their fantasy value drop. The last two players are sell-high candidates following strong starts to the season. 

So, which players should fantasy managers buy and sell for Week 4 of the fantasy baseball season? Let's dive in.

Undervalued Fantasy Baseball Players to Trade For

Jesus Luzardo, SP, Philadelphia Phillies

Philadelphia Phillies starting pitcher Jesus Luzardo has had some rough starts to begin the season. He allowed six runs on six hits across six innings against the Rangers on March 29, gave up five runs across 4 2/3 innings against the Diamondbacks on April 10, and allowed nine runs (eight earned runs) on 12 hits across 5 1/3 innings in his most recent start against the Cubs last Wednesday.

Despite those outings, Luzardo is the best buy-low pitcher in all of fantasy baseball right now. He threw 6 2/3 innings of one-run ball with 11 strikeouts in a dominant start just a few weeks ago, and his early-season metrics suggest he'll eventually turn it around. His chase rate (37.4%), whiff rate (33.9%), strikeout rate (30.6%), and hard-hit rate (31.7%) all rank in the top 25% of the league.

On top of that, his expected ERA (3.59) is 435 points lower than his actual ERA (7.94). So, it's fair to assume that he has gotten a bit unlucky on the mound in the early going. His overall numbers will eventually even out, and the southpaw will return to being a consistent fantasy pitcher. That makes him the perfect buy-low candidate in Week 4.

The big thing with Luzardo is that his swing-and-miss stuff is still present. That's a clear sign he will be just fine in fantasy moving forward.

Jesús Luzardo, Nasty 89mph Sweeper. ✝️🦎 pic.twitter.com/v4sZDi6S28

— Rob Friedman (@PitchingNinja) April 15, 2026

Chase DeLauter, OF, Cleveland Guardians

Cleveland Guardians outfielder Chase DeLauter has cooled off significantly since the start of the season. After hitting .300 (15-for-50) with five home runs, four doubles, and 12 RBI in his first 15 career games, DeLauter has struggled offensively in the past week. He has just one hit over his last 27 plate appearances and has seen his batting average drop to .219 on the season.

However, fantasy managers should capitalize on DeLauter's slump and trade for him in all formats. Every hitter goes through a rough patch at the plate at some point in the season, especially rookies in their first year. This is just one of those slumps. There is reason to be optimistic, though, that this recent stretch won't last forever.

His xwOBA (.374), expected slugging (.505), barrel rate (13.6%), squared-up rate (32.2%), and average exit velocity (91.4 mph) all rank in the upper half of the league. DeLauter is also showing such strong plate discipline to start his Major League career with a 17.4% whiff rate, a 20% chase rate, and a 13.8% strikeout rate across 84 plate appearances.

Therefore, DeLauter should return to being a solid fantasy contributor shortly.

Roman Anthony, OF, Boston Red Sox

There are a lot of fantasy managers who are disappointed by Boston Red Sox outfielder Roman Anthony early on. He is slashing just .234/.366/.338 with one home run, three doubles, four RBI, and 15 walks across 21 games this season. His strikeout rate (26.1%) and whiff rate (30.4%) both remain extremely high, and the power numbers have not been present so far.

But it's only a matter of time until Anthony really gets going. He ranks in the 70th percentile or better in average exit velocity (92.8 mph), barrel rate (11.5%), hard-hit rate (48.1%), launch angle sweet-spot rate (40.4%), and squared-up rate (29.5%). The lefty slugger has also been smashing fastballs in the first few weeks, batting .293 with four extra-base hits and a .476 expected slugging percentage on that pitch alone.

Anthony is simply too talented not to eventually figure things out at the plate. He batted .292 with eight home runs, 18 doubles, 32 RBI, and four stolen bases in 71 games as a rookie, and has the tools to be a fantasy superstar by the end of the 2026 season. So, see what it would take to acquire the 21-year-old in a trade in your league.

Roman Anthony knots the game with an RBI single 💪

📺 MLB Network + Banana Boat pic.twitter.com/CqMKWZHEow

— MLB Network (@MLBNetwork) April 20, 2026

It's too early to fully panic on Anthony yet. His metrics should give managers enough confidence in him moving forward.

Overvalued Fantasy Baseball Players to Trade Away

Will Warren, SP, New York Yankees

New York Yankees starting pitcher Will Warren is coming off arguably the best start of his career. He threw seven innings of two-run ball with 11 strikeouts against the Kansas City Royals over the weekend. Warren was in complete control in his fifth start of the season, generating 11 swings-and-misses and totaling another 21 called strikes.

That performance marked another strong start for the right-hander. He has allowed only two earned runs or fewer in all five of his starts and has punched out at least six batters in three of his last four outings. However, Warren is a clear sell-high after his 11-strikeout game against the Royals. There is definitely some regression coming his way.

For starters, Warren has been giving up a lot of hard contact this season. Both his hard-hit rate (44.8%) and average exit velocity (90.6%) rank in the bottom 30% of the league. It's also hard to imagine him keeping up his strikeout numbers with a low whiff rate (23.8%), a low chase rate (26.2%), and a low 12.5% putaway rate on his sweeper.

Warren has shown some encouraging things early on, but he's simply overperforming. He has completed five innings just twice across his five starts, and his expected ERA (3.64) is 115 points higher than his actual ERA (2.49). That makes now the best time to move off him in most leagues.

Michael Soroka, SP, Arizona Diamondbacks

Arizona Diamondbacks starting pitcher Michael Soroka has been a pleasant surprise to begin the season. He is currently 4-0 with a 2.78 ERA, a 1.059 WHIP, and 28 strikeouts across 22 2/3 innings pitched, and delivered another dominant outing last week. Soroka threw seven innings of two-run ball with five strikeouts against the Toronto Blue Jays on April 17.

A few answers from Michael Soroka tonight on starting 4-0 and having confidence in himself through the ups and downs of his career:

“I think I’m better than I’ve ever been.” pic.twitter.com/f6JJ8cn62s

— Alex Weiner (@alexjweiner) April 18, 2026

The problem, though, is that Soroka's metrics are worrisome moving forward. His expected ERA (4.91) is 213 points higher than his actual ERA (2.78), and his average exit velocity (91.7 mph), barrel rate (16.1%), hard-hit rate (48.2%), and expected batting average against (.259) all rank extremely poorly. That's a telling sign that some regression could hit him hard within the next few weeks.

It's no doubt difficult to sell Soroka right now, knowing he has pitched well in his first four outings. However, the metrics tell a very different story. He has a 35th percentile whiff rate (23.3%), and his four-seam fastball has been his worst pitch so far. Opposing hitters are batting a whopping .385 with a .615 slugging percentage against that pitch in 2026.

Given that Soroka throws his four-seam fastball most often (34.3%), selling him while his value is so high is a smart move.

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