Suspended Minnesota Vikings running back Adrian Peterson, 29, pled no contest to a misdemeanor reckless assault charge last month for injuring his 4-year-old son in May while disciplining him with a wooden switch. Photograph: Brendan McDermid/Reuters

The NFL Players Association filed a lawsuit against the National Football League on Monday challenging an arbitrator’s decision to uphold the leagu(...)

New England Patriots quarterback Tom Brady: completed 21 of 35 passes throwing for 287 yards  as the Patriots gained revenge for the opening game loss at Miami. Photograph: Matt Campbell/EPA

The New England Patriots, the Indianapolis Colts and Denver Broncos clinched divisional titles and playoff berths with wins on Sunday while the Green (...)

NFL owners unanimously endorsed a revised personal conduct policy in the wake of several domestic violence incidents involving players. Photograph: Jeff Kowalsky/EPA

National Football League (NFL) owners unanimously endorsed what they called a “revised and strengthened” personal conduct policy in the wake of severa(...)

In a letter to Minnesota Vikings running back Adrian Peterson, NFL Commission Roger Goodell said “you have shown no meaningful remorse for your conduct.”   Photograph: Jeff Curry/ USA Today

Minnesota Vikings running back Adrian Peterson has been suspended without pay for at least the remainder of 2014 season, the National Football Leag(...)

 Denver Broncos quarterback Peyton Manning  is surrounded by the media after a game against the San Francisco 49ers in which he broke the all-time NFL record with 509 career touchdowns. Photograph:  t Doug Pensinger/Getty Images

Peyton Manning paid tribute to team-mates past and present after breaking Brett Favre’s NFL record for most career touchdown passes.Denver Broncos qu(...)

Quarterback Shane Morris (left) of the Michigan Wolverines is helped off the field by Ben Braden during the fourth quarter of the game against the Minnesota Golden Gophers  in Ann Arbor, Michigan, last month. Photograph: Leon Halip/Getty Images

The Michigan Wolverines were trailing the Minnesota Golden Gophers 30- 7 in the final quarter of an American college football last Saturday when the M(...)

Arizona Cardinals running back Jonathan Dwyer (right) is charged with aggravated assault in connection with two alleged incidents of domestic violence. Photograph: Brad Penner/Reuters

The National Football League’s woes continue to mount after another professional American footballer was arrested on domestic violence charges, addin(...)

Adrian Peterson is accused of using a branch to slap his son in an incident last May. Photograph: Jeff Curry/USA Today

The crisis over the National Football League’s handling of allegations of domestic and child abuse by professional American footballers has deepened w(...)

 San Diego Chargers receiver Keenan Allen (left) can’t avoid  Seattle Seahawks safety Earl Thomas. Photograph: Paul Buck

Defending Super Bowl champions the Seattle Seahawks experienced a surprise 30-21 loss to the San Diego Chargers while Peyton Manning led the Denver B(...)

US football player Ray Rice: video showed him knocking fiancée unconscious with a blow to the head and dragging her out of a lift. Photograph: Gary Cameron/Reuters

The National Football League (NFL), the professional body governing American Football, has hired former FBI director Robert Mueller to investigate how(...)