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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Aaron Hill ARI | 2B

Hill fell off the face of the earth after his amazing ’09 season, and he has never been able to get things going since then. Recently however, he has started to heat up and get his power stroke back. He plays a tough position to fill on fantasy teams which we obviously like, and with 29 extra base hits already this year it looks he could be coming around. (about 50% owned)

Ernesto Frieri LAA | RP

I am going to keep adding Frieri to this list until he is owned in more leagues. It’s still shocking to me that he isn’t more widely owned. Not only is his ERA and WHIP under 1, but he has 53 strikeouts in only 31 innings of work. Frieri is still splitting the closer role with Downs, but he has by far had the majority of the recent save chances. (about 70% owned)

Tom Wilhelmsen SEA | RP

June has been a great month for Wilhelmsen as he continues to strengthen his hold of the closer role for the Mariners. During June he is 5 for 5 with his save chances, and during 10 innings of work he has 14 strikeouts and 0 earned runs. I do expect him to hit a few bumps in the road, but it looks like Wilhelmsen could be a nice source of saves if you need help in that category. (about 40% owned)

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Carlos Marmol CHC | RP

At this point in his career it’s really hard to trust Marmol, but he is still a closer that has a big upside. He has been solid in the last week or so, and he might be on the verge of figuring things out. As long as you can deal with the occasional 3 earned run performance, Marmol should still be a decent source of Ks and saves. (about 50% owned)

Colby Rasmus TOR | OF

A couple years back Rasmus was one of the most interesting young fantasy outfielders, but he has yet to put together a great fantasy year. However he is starting the heat up, in June Rasmus has hit well over .300 with 6 HRs and 15 RBIs. I am not sure he can keep up this pace, but the potential is certainly there. (about 50% owned)

Ben Revere MIN | OF

Since June 1st Revere has raised his average well over 20 points, and he has 8 stolen bases during that stretch. He isn’t going to bat for any power, but guys that can bat for average and throw in consistent speed can be a great help to any fantasy team. The young outfielder for the Twins is starting to show some promise, and he could be a nice addition if you need help with bags. (about 20% owned)

Casey McGehee PIT | 1B/3B

McGehee was a solid fantasy player in 2010, but his numbers really took a hit last year. I was surprised to see though that even with some recent success he isn’t getting much love in the fantasy world. Even though he had a bad 2011, he is a proven fantasy player and I do think he has solid potential this year. McGehee is far from a guarantee, but if you need help at first or third I think he is a great gamble. (about 10% owned)

Brandon Moss OAK | 1B/OF

Moss is currently batting just under .280, but I expect that to go down. Even though I don’t expect Moss to bat for that great of an average, his power potential is definitely there. He had 15 HRs this year in the minors before getting called up, and he already has 7 HRs in 43 at bats in the bigs. (about 5% owned)

Roy Oswalt TEX | SP

Oswalt is set to make his first start for the Rangers in 2012, and it’s going to be interesting to see how he does. The Rangers should be able to give him plenty of run support, so wins shouldn’t be that hard to come by. Oswalt has always been a great pitcher when healthy, and since he has had so much time to rest I wouldn’t be surprised if he starts off hot. I think he is well worth an add in most leagues, and he is a great sell high candidate if he gets off to a good start. (about 35% owned)

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Kirk Nieuwenhuis NYM | OF

The young lead off hitter for the Mets has put together a decent season thus far. He has 17 extra base hits, and he throws in a little bit of speed as well. I am not expecting huge things from him this year, but it looks like he might be on the verge of making some noise in the fantasy world. (about 20% owned)