In the 2019 Stanley Cup playoffs the Capitals had a 2-0 series lead against the Carolina Hurricanes and it looked like it was going to be an easy trip to the 2nd round.
Then this fight happened.
Ovechkin knocked out Svechnikov and it turned the series. The Hurricanes would come back to beat the Capitals in 7 games and while Svechnikov didn't play against in the series, it made his team rally.