Waiver Wire is our weekly 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. We’ll be here all season to let you know which players to watch, who to ignore, and most importantly, who to pick up. If you have any waiver wire questions, feel free to post them in our Fantasy Baseball Forum.

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Tom Wilhelmsen SEA | RP

Wilhelmsen has been amazing in the last month and I think he needs to be owned in way more leagues at this point. He has a strong hold on the closer role for the Mariners, and if he keeps pitching like this he could end the year as a top 10 closer. He hasn’t given up an earned run since May 23rd, so if you are at all looking for some relief pitcher help you need to pick up Wilhelmsen before it’s too late. (about 55% owned)

Casey McGehee PIT | 1B/3B

It’s amazing to me that McGehee isn’t owned in more leagues at this point. He has proven in the past that he can bat for power and average, and he has been on fire in the last 30 days. During that stretch he is batting .310 with 5 HRs and 19 RBIs. McGehee is starting to get things going, and with his dual position eligibility I think he is well worth a gamble in most leagues. (about 10% owned)

Salvador Perez KC | C

Perez was one of our favorite sleepers coming into the year, and now that he is healthy we think it’s time to scoop him up. This young catcher was impressive in limited at bats last year, and he has been playing great so far in 2012. At this point he has just under 40 at bats, and he is batting close to .400 with 6 extra base hits. Even if you already have a catcher I think he is worth picking up since he could offer instant trade value. (about 25% owned)

Add in Deeper Leagues

Carlos Marmol CHC | RP

Even though at this point I don’t expect to ever see the Marmol of old, I still think he is worth owning in most leagues. His numbers in the last month have been solid, and while he will have the occasional bad outing he should still be a decent source of saves. If you are desperate for saves then you might want to give Marmol a look. (about 60% owned)

Travis Wood CHC | SP

Wood is quickly turning into a young pitcher who is not only worth keeping an eye on, but in a lot of cases is worth a roster spot. He has pitched great in his last 6 starts, and he could be on the verge of breaking out. Wood has been all over the place with his production in the minors, but he has had some amazing numbers at times. He is a young pitcher with a big upside, and even though he walks a good amount of people and doesn’t have the best K rates, I think he is still worth a look in deeper leagues. (about 15% owned)

Michael Fiers MIL | SP

Since getting called up this Brewers pitcher has been on fire. So far in 6 starts he has over a K per inning, and an era just over 2. Fiers wasn’t pitching that well this year in the minors before he got called up, but he did have an amazing year in the minors in 2011. Fiers has good stuff and he is obvisouly making an impact with his time so far in the majors. I doubt he will keep up this pace, but I think he is worth an add in most leagues just in case he does. (about 35% owned)

Norichika Aoki MIL | OF

Aoki hasn’t had as much hype around him as some of the other Japanese players that have come over, but he is starting to make some noise. While he doesn’t have a ton of power, he does have a lot of extra base hits, steals, and a decent batting average. Aoki put up big numbers playing in Japan including 3 seasons in which his batting average was just around .350. I don’t think Aoki has a huge upside, but if you are looking for a guy that can bat for average and throw in some speed then he is your guy. (about 35% owned)

Yasmani Grandal SD | C

Grandal is an interesting young catcher, and I think he is worth adding in a lot of leagues. He was batting well over .300 in the minors before he got called up this year, and his hot bat has continued to produce in the bigs. I don’t think he will continue his current power streak (4 HRs in 20 at bats), but you need to pay attention to any catcher who can potentially bat over .300. (about 15% owned)

Add to Watch List

Dylan Bundy BAL | SP

The 4th overall pick for the Orioles in last years draft is starting to have some chatter around him about a potential call up. It doesn’t seem likely that it will happen any time soon, but all of the dynasty and keeper leagues need to pay close attention to him. He has looked great so far in the minors, and while he might not get called up this year he certainly has huge long term potential. (about 5% owned)