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The 20 Biggest Locker Room Cancers in Sports

Players who are leaders on and off of playing surfaces are invaluable to their teams. They are part-time coaches who help boost the performances of those around them. In some cases, top-tier team captains even keep teammates out of trouble before, during and after regular seasons. The likes of Peyton Manning, Tom Brady, Derek Jeter, Mario Lemieux, Tim Duncan and so many others are respected by fans, analysts and their peers for what they did behind the scenes when nobody was watching as much as they are praised for all that they accomplished on the field, on the court and on the ice during their historic careers.

At the other end of the spectrum are athletes who are referred to as being locker room “cancers;” players who alienate coaches, teammates and even fans with their behavior. Some of those individuals were/have been able to overcome their own personalities and produce positive numbers for their teams despite the fact that not everybody playing alongside them was keen on doing so. Others, however, could not help but constantly trip over themselves en route to costing themselves years of playing time that would have netted them millions of dollars in salary figures and potential endorsement deals.

Every player featured in this piece either possesses or had, during their primes, elite athletic ability that landed them in professional sports. Some even deserve to Hall-of-Fame honors because of how well they played during their careers, even if they didn't make friends in organizations. With great talent comes great responsibility, to steal a phrase, and those who fail to learn that there is no “I” in “team” are quickly exiled by clubs the moment that they are no longer worth the headaches that they create. In fact, this list begins with a young talent who was released in the prime of his football career.

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20 DeSean Jackson - NFL Wide Receiver

Mark J. Rebilas-USA TODAY Sports Images

The Philadelphia Eagles stunned the pro football world last March when, seemingly out of nowhere, the club parted ways with the talented wide receiver. Rumors emerged that Jackson may be involved with some questionable people in his personal life, and it was later reported that he was not well liked inside of the Philadelphia locker room to the point that head coach Chip Kelly was happy to dump Jackson and get nothing in return rather than shop a play-maker who would have netted the Eagles a decent draft pick in such a deal. Do not cross Mr. Kelly, current and future Philadelphia players.

19 Ryan Leaf - NFL Quarterback

Via businessinsider.com

18 John Terry - Premier League Centre Back

Via independent.co.uk

Some athletes anger teammates by not giving it all they have during games, and others are accused of having affairs with the significant others of teammates, as was the case with the Chelsea star back in 2010. What exactly happened, if anything at all, may never be known for sure, but the rumors resulted in Terry being stripped of his England captaincy for some time. Despite that story and other blunders, including Terry being accused of racially abusing an opponent during a game, Terry remains a beloved figure among many who follow Chelsea each and every English Premier League campaign.

17 Gilbert Arenas - NBA Point Guard

Via complex.com

Firearms possession is a hot-button topic in the United States every year. Regardless of where you come down on the matter, everyone should be able to agree that the locker room is no place for guns. Arenas didn't get that memo in December of 2009, when it was learned that he had stored guns inside of the locker room of the Washington Wizards. That curious decision resulted in Arenas earning a lengthy suspension from the NBA, and it was also the beginning of the end of his Washington career. “Agent Zero,” as he has been known, has not played in the league since 2012.

16 Alex Rodriguez - MLB Third Baseman/Shortstop

Greg M. Cooper-USA TODAY Sports Images

You have to give A-Rod credit in that he has never been shy about being “me over team” since linking up with the New York Yankees. The only reason that Rodriguez remains an active Major League Baseball player heading into the spring of 2015 is that the Yankees are already paying him a boatload of money, so they might as well try to get something productive out of him during games. Nobody can deny that Rodriguez was, when at his best, an incredible talent and maybe the best player of his generation. That he won't be remembered for his positive contributions is only his fault.

15 Albert Haynesworth - NFL Defensive Tackle

Via galleryhip.com

The former NFL defensive tackle rewarded the Washington Redskins for giving him a massive contract by refusing to participate in team workouts, showing up to training camp out of shape, and giving what could generously be referred to as half-efforts during games. He didn't play two full seasons with the Redskins before Washington cut ties with the player, and he is often regarded as being the worst free agency signing in league history. Not to be outdone by what he achieved with the Redskins, Haynesworth went on to cause trouble for the New England Patriots before the Pats gave up on him after four months.

14 Milton Bradley - MLB Outfielder

Anybody who watched Bradley during the early stages of his baseball career could see that he had the goods to be a perennial All-Star. He just could not control his temper, nor could he remain in the good graces of any team for a significant length of time. Bradley reportedly attempted to confront a television announcer regarding comments made during a game, he publicly buried the Chicago Cubs while with the club, and he also got into a confrontation with manager Lou Piniella. In total, Bradley played for eight clubs during his career, never reaching the high expectations that were had for him when he broke into the league.

13 Carmelo Anthony - NBA Forward

Adam Hunger-USA TODAY Sports Images

The public got a glimpse of what some around the NBA think of Anthony this past summer when no team went out of their way to acquire him via free agency. Anthony, who has never met a shot that he didn't like as a professional player, ultimately returned to the New York Knicks, giving the club somewhat of a hometown discount in the process. That deal could still do more harm than good for the Knicks over the next several years, a time in which the team is in a painful rebuilding process. New York, a club that has no trouble drawing crowds despite the team's lousy record, would have been better off moving on from Anthony.

12 Dez Bryant - NFL Wide Receiver

Matthew Emmons-USA TODAY Sports Images

11 Latrell Sprewell - NBA Shooting Guard/Small Forward

Via nydailynews.com

Being a pro basketball coach is a daunting challenge. One has to deal with millionaire players, many of whom bring millionaire attitudes and egos to practice sessions and games. P.J. Carlesimo likely found himself considering a career change in 1997 when he was on the receiving end of a Sprewell choke during a team practice. Sprewell, who was a four-time All-Star by the time he retired as a player, wouldn't play in the NBA again until 1999, and his reputation was forever ruined. The choking incident is what he is most remembered for, along with a moment that including him stating that $21 million was not enough to feed his family.

10 Keyshawn Johnson - NFL Wide Receiver

Kirby Lee-USA TODAY Sports Images

Before the days of Johnson being an entertaining NFL television analyst who appears across the ESPN family of networks, he was a typical diva wide receiver. He wrote a book entitled Just Give Me the Damn Ball that did him little favors among teammates, and Johnson aggravated head coach Jon Gruden to the point that Gruden deactivated Johnson in November of the 2003 regular season. Johnson has since hit out at Gruden regarding their relationship while they were with the Tampa Bay Buccaneers, and he and Warren Sapp have not had nice words about each other since retiring from the game.

9 Vince Young - NFL Quarterback

Via complex.com

8 Mario Balotelli - Currently Plays for Liverpool (EPL)

Via eurosport.com

At just 24 years old, Balotelli could still evolve into the player many thought he would be when he linked up with Inter before the start of the 2007-08 season. While he has buried a plethora of highlight reel goals for clubs and for nation over the years, Balotelli has also played himself off of four clubs and out of two countries. Liverpool are already reportedly sick of his antics just five months into his stint with the club, and it is rumored that the Premier League outfit may not keep Balotelli through the completion of the current season. For all of his talent, Balotelli has not been worth the trouble.

7 Chad Johnson - NFL/CFL Wide Receiver

Via thesportscrave.com

6 Manny Ramirez - MLB Outfielder

5 Randy Moss - NFL Wide Receiver

Via en.wikipedia.org

4 Jeff Kent - MLB Second Baseman

Via espn.go.com

Just how much of a problem was Kent when he was with the San Francisco Giants? Some believed him to be the biggest clubhouse cancer on a team that included Barry Bonds. Tension grew between the two players, so much so that it was reported that Kent and Bonds got into an altercation during the 2002 Major League Baseball season. Despite Kent's impressive offensive output and the success of the Giants, he lost the support of everybody within the organization and even among reporters who covered the club. Kent would have little to complain about, however, earning millions upon millions of dollars from the Houston Astros and Los Angeles Dodgers.

3 Richie Incognito - NFL Guard

Winslow Townson-USA TODAY Sports Images

One of the dirtiest players in the NFL, Incognito was featured in national headlines in the fall of 2013 when ESPN reported that he had harassed Miami Dolphins teammate Jonathan Martin. Stories of Incognito using racist and homophobic slurs emerged, and Martin left the team because he actually feared for his safety. Incognito was suspended for the remainder of the season, and he never again played for the Dolphins. Despite the fact that the 31-year-old has All-Pro talent and is eligible to sign for the team of his choice, Incognito remains a free agent. His future as an active NFL player remains up in the air.

2 Terrell Owens - NFL Wide Receiver

Via philadelphia.cbslocal.com

Join a team. Flash elite wide receiver skills. Annoy just about everybody within the organization. Sign for a new club, and then start all over again. It was the T.O. Cycle that repeated itself on three occasions when Owens was, talent wise, one of the best receivers in the NFL. Nobody could question that Owens was a gamer – he played for the Philadelphia Eagles in a Super Bowl while essentially on one foot – but his attitude wore thin with every team he played for during his career. Owens could have been one of the greats, but his playing days ended with a whimper instead of with a team press conference during which he was praised for his play.

1 Barry Bonds - MLB Left Fielder

Bonds was said to have a legendary ego throughout his career, and his teammates happily informed the press of their attitudes regarding the player for years. They told stories of Bonds refusing to attend team events, and also of Bonds distancing himself from others inside of the clubhouse. “In the San Francisco Giants clubhouse, everybody knows the score is 24-1. There are 24 teammates, and there's Barry Bonds” was once written about the player. That so many knowledgeable baseball people refuse to view Bonds as any time of home run king is karma haunting a man who seemed to be downright miserable despite his wealth and numerous successes.

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