Just 34 minutes into the clash between MLS conference leaders on Wednesday night, the former Aston Villa and Middlesbrough goalkeeper was sent off.
The 33-year-old USA international rushed off his line in a futile attempt to prevent Khiry Shelton from getting a clear shot away, but merely sunk his studs into the 24-year-old instead of clearing the ball.
1:10 for Guzan's dismissal
Guzan's face said it all.
Back-up goalkeeper Paul Christensen replaced Guzan, meaning midfielder Hector 'Tito' Villalba was forced to make way.
Atlanta slipped to a 2-0 defeat after second-half goals from Daniel Salloi (67') and Gerso Fernandes (87').
"Unfortunately for Guz, he has to make that play," Sporting KC manager Peter Vermes told MLSsoccer.com when asked about the sending-off.
"If he doesn’t take out Khiry [Shelton], Khiry goes in and taps it into an open net."
When Guzan was asked if it was the correct decision to send him off, the net-minder replied: "Um, yeah... it was a red card."
Get the best features, fun and footballing frolics straight to your inbox every week.
Thank you for signing up to Four Four Two. You will receive a verification email shortly.
There was a problem. Please refresh the page and try again.