Fantasy Baseball Waiver Wire Additions (Apr. 20)

If you're new to this feature, here are the ground rules. 

No player in this space will be mentioned in back-to-back weeks, as we don't want to spam you with the same choices over and over again. We'll also limit the waiver wire suggestions to players owned in fewer than 40 percent of FOXSports.com leagues. Got it? Let's get to the Week 3 fantasy baseball waiver pickups:   

Catcher

Welington Castillo, ARI: (16.3% owned)

There aren't many available catchers out there with 20+ HR power, but Castillo is one of them. He hit 19 in 342 at-bats last year, which he should easily surpass this season. Playing in a good hitter's park with a solid lineup around him all year won't hurt his numbers, either.

First Basemen

Byung Ho Park, MIN: (12.7% owned)

I'm shocked how under-owned Park is for the incredible power upside he clearly has. He's homered in three of his last four games and it seems like he's fully making the adjustment to major league pitching. Remember, he hit over 50 homers in Korea the last two seasons. This guy can smash. 

Second Basemen

Logan Forsythe, TB: (31.6% owned)

I thought Forsythe was being drafted too low after a breakout season with the Rays last year. This is a guy who hit .281 with 17 HR and 9 SB in his first full-time campaign, and he still occupies a spot right in the middle of Tampa Bay's lineup. His dual position eligibility makes him even more attractive. 

Third Basemen

Travis Shaw, BOS: (20.8% owned)

I don't think we can trust Pablo Sandoval to return anytime soon, and even if he does, Shaw has been too good to sit. The power is there (13 HR in 226 at-bats last year) and Shaw has a .916 OPS so far this season. He gets on base at a high clip and won't hurt you in any area, especially batting behind Boston's boppers. Go get him. 

Shortstops

Trea Turner, WAS: (2.7% owned)

He's raking in the minors right now (.993 OPS in AAA) and makes for a great stash if you can afford burning a roster spot. Washington can control Turner's rights through 2022 instead of 2021 if they wait until roughly June 1st to promote him, so that seems like the path they'll take. He should easily overtake Danny Espinosa and be an impact starter once he comes up. 

Outfield

Denard Span, SFG: (30.2% owned)

Maybe it's been a while since you thought about Denard Span, but he's receiving regular playing time in San Francisco. In his last full season (2014), Span stole 31 bases and hit .302. Maybe we can't ask for that at age 32, but Span should eclipse 20 stolen bases this year if you need help in that category. 

Starting Pitcher

Hector Santiago, LAA: (24.3% owned)

Santiago has always been a good pitcher in terms of ERA (3.51 career mark over six years), but walks and homers have always been an issue. Even with that being the case, Santiago has some great defenders behind him in Los Angeles and is striking out a batter per inning thus far. He's a great pickup for weeks when he's a two-start guy. 

Relief Pitcher

Kevin Jepsen, MIN: (9.3% owned)

With Glen Perkins still sidelined, Jepsen has been the closer for the Twins. Jepsen has two saves to his name this year, and even though he hasn't been great in the process, finding saves on the wire can often be tough. For now, he's worth owning.