Defense wins championships, and there are many NBA teams that could use a little extra help through free agency to improve in that area this offseason.
Lockdown defenders are even more valuable with the way franchises are loading up on offensive talent, but there aren't too many available.
Here are the top five defensive stalwarts on the market in 2011.
He's a good defensive rebounder and his size makes a big impact in the paint.
The veteran center can be an anchor at the rim and his services are widely sought after.
Arron Afflalo is now viewed as a prized possession, mainly because of the limited availability of guards in this season's free-agent pool.
He is best known for his aggressive defense and he can be put up against the opponent's top offensive guard without any hesitation.
Afflalo is a smart player and he'll provide a big boost defensively for any team that can sign him.
Nevertheless, he is one of the best defensive big men on the market, mostly because of his top-notch shot-blocking skills.
Jordan is young and training with Hakeem Olajuwon this past offseason can only make him better.
The Mavericks are unlikely to re-sign their veteran defensive stopper, but there are a good number of teams looking to bring him on as a role player.
The 30-year-old isn't a great offensive player, however, he plays tough defense on the perimeter.
Stevenson matched up with the likes of Russel Westbrook, Kobe Bryant and LeBron James during the Mavs' playoff run last season and played solid. He is certainly the best guard defensively on the market right now.
Tyson Chandler is the top defensive specimen available in free agency. He exhibits excellent rebounding and his athleticism, when healthy, allows him to control the paint.
He made a huge impact last season with Mavericks as the anchor of their championship-winning defense, but he's doubtful to return because of his value.