Our fantasy baseball waiver wire column takes a look at players available in many leagues that could have an immediate impact on your fantasy roster, or simply just players to keep on your radar. Let’s take a look some of the top waiver wire pickups heading into Week 13 of the MLB season. If you have any questions on who to pick up or who to drop, feel free to post them in our Fantasy Baseball Forum.

Add in all leagues

Billy Butler KC | 1B

Billy didn’t get off to the best start this year and he was dropped in a decent amount of leagues. As of late though he has started to get things going and it’s time to pick this guy back up. He isn’t going to bat for a ton of power, but he has the potential to do a little bit of everything else and give you a solid batting average. (about 65% owned)

Yovani Gallardo MIL | SP

After a sub par 2013 year it looks like the fantasy world has turned their back on this young power arm for the Brewers. I think it’s too early to give up on him though and he should be owned in more leagues than he is. His strikeouts are down a bit so far this year, but he still has a ton of overall potential and I think he could end the year as a top 30 starting pitcher. (about 65% owned)

Add in deeper leagues

Neil Ramírez CHC | RP

Ramirez is battling Hector Rondon for the Cubs closer role and he is making this a tough call for the Cubs coaching staff. So far Ramirez has an ERA of just over 1 and well over a K per inning, with 17 innings of work so far in 2014. It still looks like it’s Rondon’s job to lose for now, but don’t be surprised if Ramirez takes over that role at some point. (about 25% owned)

Brock Holt BOS | 1B,3B,OF

Holt is a guy that could be a big time fantasy star someday and that day might be sooner rather than later. Since getting called up this year he has been on fire, hitting well over .300 with a decent amount of speed mixed in. When you combine that with his position eligibility, then I don’t see how you can go wrong with picking up this kid. (about 15% owned)

Danny Santana MIN | 2B,SS,OF

There are a lot of reasons to like Santana, he is young, has great position eligibility, and he has looked great so far with just over 100 major league at bats. Santana was pretty good in the minors, so his great numbers in the bigs aren’t a complete surprise. If you need help with your middle infield or you need another outfielder, then I would strongly consider giving him a look. (about 50% owned)

Scooter Gennett MIL | 2B

Scooootttteeerrrrr, why is he only owned in 10% of leagues. I know he gets regular days off whenever the Brewers are facing a left handing starting pitcher, but he is still going to get plenty of at bats this year. He is batting over .300 with decent power and speed and I think he needs to be owned in way more leagues. (about 10% owned)

Nick Castellanos DET | 3B/OF

Castellanos was one of the biggest young sleepers heading into the season, but after a slow start the fantasy world quickly gave up on him. However, it looks like it might be time to start giving him attention again. So far in June he is batting well over .350 and it looks like he is starting to get things going. (about 30% owned)

Kevin Gausman BAL | SP

This young pitcher for the Orioles has a bright future and he is off to a solid start since getting called up to the bigs. Gausman was great in the minors and it’s possible that he could have an instant fantasy impact. I do think he will hit a few bumps in the road this year though, so don’t drop any proven players to get him. (about 15% owned)

Jake Arrieta CHC | SP

The former Oriole has been pitching great for the Cubs and he has certainly gained the attention of the fantasy baseball world. He hasn’t been pitching that deep into games, but his ERA is under 2.00 and his K rates are great. He has shown flashes in the past the he could be the real deal and I think he is worth a gamble in deeper leagues. (about 25% owned)

Andrew Heaney MIA | SP

Heaney is one of the best young starting pitcher prospects in the league and he was picked up in a lot of leagues after he was called up to the majors. I do think he has a chance for some instant success, but I wouldn’t drop any proven pitchers to take a gamble on this youngster. If you are in any type of keeper or dynasty league though then he needs to be added ASAP. (about 45% owned)

Keep an eye on

Robinson Chirinos TEX | C

I wasn’t that impressed with the minor league stats from Chirinos, but it’s hard to ignore what he has done so far in the majors. He is off to an amazing start and if you are looking for a young catcher to take a gamble, on then he is your man. I do expect him to cool back off at some point though, so keep that in mind if you end up picking him up. (about 5% owned)