What can NBA coaches challenge during games? Explaining the new rule for the 2019-20 season | Sporting News
Tampa Bay Buccaneers head coach Lovie Smith throws the challenge flag in second half action against the Indianapolis Colts at Lucas Oil Stadium on Sunday, Nov. 29, 2015 in Indianapolis, Ind. The
Steelers lack of success throwing the challenge flag continues in 2018 - Behind the Steel Curtain
Nick Canepa: Most bad NFL teams fire their coaches. Not the Chargers, who remain loyal to the blundering Brandon Staley. - The San Diego Union-Tribune
WNBA coaches able to challenge calls in 2023 season - Just Women's Sports
387 Nfl Coach Challenge Flag Stock Photos, High-Res Pictures, and Images - Getty Images
NFL challenge rules: What can a coach challenge (and not)?
NBA Coach Challenge: How many are there and how do they work? - AS USA
NBA Coach's Challenge Data Yields Surprising Results
Klopp calls for coach's challenge in football | beIN SPORTS
Ruling on Coach's Challenge: Inconclusive - The New York Times