Justin Gatlin shrugged off the boos to stun Usain Bolt in the 100m final at the world championships.
Here's how Twitter reacted:
"FINAL INSULT…WHAT A DOPE."
— Mail on Sunday tweet their sports front page, condemning Gatlin who has served two doping bans.
"Leaves a sour taste in the mouth but #Bolt won't be remembered for tonight. Total game changer. #legend."
— Former England football star Michael Owen @themichaelowen
"No one saw that happening no one wanted that to happen #Gatlin."
— British athlete Kelly Sotherton @KellySotherton
"Imagine becoming world champion only to have the fans boo you and chant the name of the guy in 3rd place. London fans are savage."
— Ex-400m runner Dai Greene @DaiGreene
"The cheat!!!! Nooooooooo….."
— Former Ireland rugby skipper Brian O'Driscoll @BrianODriscoll
"I was so excited for this race and as a sports fan I feel robbed. Couldnt have been a worse result. Can deal with Bolt losing but not to a cheat #thedarksideofsport."
— Retired British swimmer Karen Pickering, now a TV commentator @Karen_Pickering
"Didn't agree with booing of @justingatlin at #IAAFWorlds but no denying this result is disaster for sport."
— Veteran athletics correspondent Duncan Mackay @Duncan_ITG
"Over an hour after the 100m, Usain Bolt is still responding to fans and their chants of "Usain Bolt, Usain Bolt" before doing more media."
— Athletics Weekly @AthleticsWeekly
"What a moment to be there live for @usainbolt's last 100m race. A great man on and off the track, who has inspired many. What a legend!"
— British heavyweight boxer David Haye @mrdavidhaye.