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 17 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.

Must add in all leagues

Joe Smith LAA | RP

I was still holding out hope that Frieri was going to figure things out, but at this point that doesn’t seem likely. That leaves the closer role to Smith and he has been solid so far this year. I don’t think he will ever be a top closer in the league, but he should get plenty of save opportunities and I think a sub 3 ERA is likely. (about 65% owned)

Jake McGee TB | RP

The Rays didn’t want to commit to a closer, but at this point it has to be McGee. He has been amazing out of the pen for them this year and he has certainly earned the closer role. McGee could be a top 15 closer during the second half of the year. (about 45% owned)

Kole Calhoun LAA | OF

Calhoun has been absolutely amazing lately and he needs to be owned in more leagues. This is a guy that we liked coming into the season and after a slow start he is starting to come alive. Calhoun has a huge upside and I suggest you find a way to get him on your team if he is still available in your league. (about 75% owned)

J.D. Martínez DET | OF

Martinez continues to scorch major league pitching and I am surprised that the fantasy world isn’t completely taking notice. The fact that this kid is still available in about a fourth of all leagues surprises me. His numbers this year with just under 200 at bats are absolutely ridiculous. You have to imagine that he will cool off to a point, but I think Martinez is the real deal and could keep up close to this pace. (about 75% owned)

Brock Holt BOS | 1B/3B/OF

This youngster for the Red Sox has a lot to offer and it’s weird to me that he isn’t owned in more leagues. He has position eligibility at three different spots, he has speed, he has power, he bats for average and he is young. I think he will have a solid second half of the season and Holt is a guy that should be getting more respect in the fantasy world. (about 55% owned)

Add in deeper leagues

Kolten Wong STL | 2B

Wong started the year in the minors, but he was playing too great for the Cardinals to keep him down in AAA. When he got called up though he didn’t exactly keep up his hot bat. This has changed though over the last couple of weeks with Wong raising his average about 20 points since late June. This kid has huge potential and I like his chances of having a solid second half of the season. If you need help at second base then he could be your solution. (about 35% owned)

Kevin Kiermaier TB | OF

In limited at bats so far this year Kiermaier has been amazing. In 158 at bats he has 22 extra base hits, he has thrown in a little bit of speed and his average is over .300. Those type of numbers don’t seem to justify the fact that he is only owned in 10% of leagues. I don’t think he will have an amazing second half, but I think he should be owned in more leagues since he does have a decent upside. (about 10% owned)

Stephen Vogt OAK | C/1B/OF

I almost added Vogt as a must add in all leagues, but I couldn’t quite bring myself to do it. He is having an amazing year though and I think he could be the real deal. Not only have his numbers been great, but he has position eligibly at three different spots including catcher. He is the perfect guy to add in daily setup leagues as a backup catcher with an upside. (about 35% owned)

Chris Carter HOU | 1B/OF

Carter has the potential to be one of the best power hitters in the league and he has been on fire as of late. His batting average has always been his biggest issue though, even after raising his average by 20 points since the beginning of July he is still barely batting over .200. Carter is still fairly young though, so I think there is a chance we haven’t seen the best out of him. If he can find a way to get his average up into the mid .200s, then he could be an amazing fantasy player. (about 25% owned)

Keep an eye on

Arismendy Alcántara CHC | 2B

Alcantara was suppose to be a temporary call-up as Barney was on paternity leave, but he has played so well that it seems like the Cubs are going to keep him in the bigs for now. So far in 23 major league at bats he has proven that he can bat for average, some power and throw in a bit of speed. When looking at his minor league stats I don’t think this is a complete fluke. If he is able to stay in the bigs for the rest of the season then I think he could certainly have the potential of being a top 15 second baseman during the second half of the season. (about 15% owned)