The coach's challenge has sacrificed its first playoff goal.
Detroit Red Wings coach Jeff Blashill successfully contended in Game 1 on Wednesday that Tampa Bay Lightning forward Jonathan Drouin skated into an offside position before his pass to Valtteri Filppula crossed the blue line on the left wing, negating Victor Hedman's go-ahead marker.
Alex Killorn scored what proved to be the game-winner for the Lightning just moments later.