Waiver Wire Rankings - Fantasy Baseball Pickups for Week 4 (Hitters and Pitchers)

April 21, 2026

Updated fantasy baseball waiver wire rankings for Week 4 of the 2026 MLB season. These are free agent options to add off waivers, and our rankings will help you prioritize.

The MLB season continues to roll on, with a couple of weeks left in April. The biggest recent injury news is that the Dodgers' star closer Edwin Diaz is now expected to miss around three months due to elbow surgery following the Phillies placing closer Jhoan Duran on the injured list with a left oblique strain on Saturday. At RotoBaller HQ, we help find those injury replacements and help navigate fantasy managers through the waiver wire with our fantasy baseball waiver wire rankings for Week 4 (April 20 - April 26) of the 2026 MLB season. 

It is essential to stay on top of the player news as we guide you through the injuries, prospect call-ups, and closer role changes. For those searching for injury replacements or whose teams need a boost, we have you covered with our latest fantasy baseball waiver wire rankings. We've been working hard to put together a list of 100 players to consider for various league sizes to help you prioritize your waiver wire decisions.   

As always, we are here to help you prioritize which player to add using our waiver wire rankings article. This edition features players such as Mickey Moniak, Brad Keller, Bryan Baker, Jake Burger, Caleb Thielbar, Lourdes Gurriel Jr., Victor Vodnik, Luke Raley, Josh Jung, and more, who are listed in our initial waiver wire rankings. Read more to see where these players rank in our waiver wire rankings for the week ahead.

Fantasy Baseball Waiver Wire Rankings

Waiver wire pickup options, including how to prioritize them for your league - depending on the league size:

The roster percentage is from Yahoo! leagues.

Fantasy Baseball Waiver Wire Outlooks

Some of the top names include Brad Keller, Joey Cantillo, Caleb Thielbar, Dillon Dingler, Luke Raley, and more.  We recap why these players rostered under 70% in Yahoo! leagues should be on your waiver wire radar:

Brad Keller, Philadelphia Phillies

Philadelphia Phillies relief pitcher Brad Keller could be asked to take on a larger role in the bullpen over the next few weeks. On Saturday, closer Jhoan Duran (oblique) was placed on the 15-day Injured List. The organization is hopeful it'll be a minimal stay for Duran, but the Phillies will still be without him for the next two weeks.

The expectation is that either Keller or Jose Alvarado will take over in the closer role while Duran is down. Given Alvarado's struggles, Keller seems like the favorite to get saves right now. Fantasy managers looking for saves might want to consider adding Keller if he ends up taking over the closer role.

Joey Cantillo, Cleveland Guardians

Caleb Thielbar, Chicago Cubs

Chicago Cubs relief pitcher Caleb Thielbar was handed the ball in the ninth inning during Saturday's game against the New York Mets. The Cubs are seeking a new closer while Daniel Palencia (oblique) is on the Injured List. Thielbar got the first crack at the closer role and did a nice job on Saturday. The veteran southpaw tossed a clean inning with two strikeouts to earn his first save of the season.

Thielbar only has six career saves, but could end up getting a majority of the save chances while Palenica is out. Ben Brown is also an option, but the Cubs likely want to keep him in his multiple-inning role. Thielbar could be worth a look in the short-term for fantasy managers looking for a source of saves.

Luke Raley, Seattle Mariners

Seattle Mariners first baseman/outfielder Luke Raley went 1-for-3 with a solo home run, a walk, and two additional runs scored in Saturday's 7-3 win over the Texas Rangers. His home run traveled 381 feet with an exit velocity of 112.7 mph. Raley is heating up and has homered twice over his last four games while logging multi-hit efforts in three of his last six contests.

Overall, the 31-year-old is slashing .318/.375/.636 with five home runs, 13 RBI, 11 runs, and a 1.011 OPS over 20 games in 2026. Raley is known as a streaky hitter but is emerging as a hitter to add off the waiver wire while he's swinging a hot bat.

He is currently rostered in 22% of Yahoo Fantasy leagues, but is more of a streamer and an option in deep leagues. Raley is currently ranked 62nd in the latest waiver wire rankings for RotoBaller.

Dillon Dingler, Detroit Tigers

Detroit Tigers catcher Dillon Dingler has been hot recently, collecting a hit in five of his last nine games with two home runs and seven RBI during that stretch. Overall, Dingler is slashing .259/.348/.517 with four home runs, 14 RBI, and nine runs over 18 games. The 27-year-old has seen increases across the board in xBA (.328) and xSLG (.694), and his HardHit% (59.1%).

His K% (18.2%) has decreased by about five points from 2025 (23.5%). For fantasy managers needing catcher help, Dingler is emerging as an add candidate in leagues with 12 teams or more. He is currently rostered in 37% of Yahoo Fantasy leagues and is 59th overall in the latest RotoBaller waiver rankings for Week 4.

First Base Waiver Wire Rankings

Pickups are in priority order:

Second Base Waiver Wire Rankings

Pickups are in priority order:

Third Base Waiver Wire Rankings

Pickups are in priority order:

Shortstop Waiver Wire Rankings

Pickups are in priority order:

Outfield Waiver Wire Rankings

Pickups are in priority order:

Catcher Waiver Wire Rankings

Pickups are in priority order:

Starting Pitcher Waiver Wire Rankings

Pickups are in priority order:

Closer/Reliever Waiver Wire Rankings

Pickups are in priority order:

Week 4 Waiver Wire Roundup for Fantasy Baseball

In addition to these waiver wire rankings, we have also put together an assortment of fantasy baseball waiver wire articles. You can see that full roundup below to help prepare you for waiver wire runs:

• Nick Mariano's waiver wire pickups (Premium)
• Staff roundtable: waiver wire picks for Week 4
• FAAB fantasy baseball waiver wire pickups for Week 4
• Starting pitcher fantasy baseball waiver wire pickups for Week 4
• Hitter streamers, starts and waiver wire pickups for Week 4
• The Cut List - Players to consider dropping for Week 4

Who Should I Pickup Fantasy Baseball Tool

Trying to decide who to pick up off the waiver wire? Check the Who Should I Pickup tool:

Who Should I Pickup?

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2026 Player Decisions. Today's focus is on specific players like Mickey Moniak, Brad Keller, Bryan Baker, Joey Cantillo, Jake Burger, Caleb Thielbar, Lourdes Gurriel Jr., Victor Vodnik, Luke Raley, Max Muncy, Carter Jensen, Noah Schultz, and Josh Jung. These are some common searches for 2026 fantasy baseball waiver wire pickups.

Using The Tool. This is a simple tool but very powerful. The first step is to enter the player names that you want to compare. In the first box, search for the first player's name. In the second box, search for the second player's name. Compare up to four MLB players at once, and then click the Who To Pickup? button to see who the recommended waiver wire pickups are based on fantasy baseball rankings, projections, and more.

Improvements For Who Should I Pickup? You may have noticed, our Who Should I Pickup? tool has gotten an overhaul. We've added lots of great features for you to give you as much information as possible to win on the waiver wire in 2026. You'll see MLB player tiles with stats, projections, and a slick new interface. We hope you enjoy!

How It Works. Our RotoBaller staff puts together their weekly fantasy baseball waiver wire rankings and projections based on their research, and updates them constantly throughout the week. That information is the core data that is powering the decision-making in this tool. When you search for player names, you will only see those players who are ranked.

Popular Player Comparison Searches - Who To Pickup

Below are some popular searches and comparisons from our Who To Pickup tool for 2026 for players like Mickey Moniak, Joey Cantillo, Brad Keller, Bryan Baker, Jake Burger, Caleb Thielbar, Lourdes Gurriel Jr., Victor Vodnik, Luke Raley, Dillon Dingler, Noah Schultz, Carter Jensen, Max Muncy, Josh Jung: