We see it every year; a team signs a free agent to a very generous deal and - surprise - he underachieves. Who are the top candidates to be disappointments his offseason? Which upcoming free agents should teams avoid? Here are five potential underachievers on the market this summer.

LW Dany Heatley

Heatley's decline has been fairly well-publicized, but that will not stop him from getting a decent deal. He will not make $7.5 million like he did this past season, but some teams will definitely be willing to dish out more cash than necessary in order to lure in the 33-year-old. Unfortunately, a return to the ranks of the elite is probably not in the cards for Heatley.

C David Legwand

In an attempt to continue their streak of postseason appearances, the Detroit Red Wings acquired Legwand from the Nashville Predators at the trade deadline. The move paid off right away, but Legwand seemed nonexistant for the past couple of weeks of the regular season and in the team's five playoff games.

He played great while he was on a line with Johan Franzen and Gustav Nyquist for his first week or two as a Red Wing, but the only time Legwand's name seemed to be heard down the stretch was when he butt-ended Pittsburgh's Evgeni Malkin with his stick.

Legwand has had a very good career, but his best days are likely behind him. Some teams will try to ink him in hopes of adding a top-six forward, but nobody should expect him to be more than a third line center at this point.

D Andrei Markov

Markov has been a very good defenseman throughout his entire career, but he has struggled with one issue: injuries.

He was able to stay off of the injured reserve for the better part of the previous two seasons and became a huge part of his Montreal Canadiens' surprising playoff appearances in those years, but signing him will be a huge risk.

Markov always seems to make a big difference when he is healthy and could be a key player for any club that signs him; however, the fact that he is now in his mid-thirties is not very reassuring when it comes to the injury concerns.

His talent level will command a pretty big check, but his injury risk is too high to take the chance.

G Ryan Miller

Miller is a big name out there who was dealt to St. Louis at the trade deadline. After a great start with the Blues, he eventually fell off and struggled in the postseason.

Many blamed the defense rebuilding Buffalo Sabres for Miller's decline in the past few years in northern New York, but he did not show too much improvement behind one of the league's best defensive units in St. Louis.

There are plenty of teams in need of a goaltender, but nobody should expect him to return to his 2010 form and therefore should not give him a huge deal.

D Kimmo Timonen

Timonen has had a terrific career and has been a top defenseman for his team for about a decade. Expectations will have to come down though for the Finn, who is 39 years old and drew all sorts of criticism in Philadelphia this year.

He can still be valuable as a leader and a second- or third-pairing d-man, but Timonen's speed is drastically decreasing and teams should not pay top dollar for him with better, younger and faster options at defense on the market.