Barnsley scored four second-half goals to thrash Wolves at Molineux and remain third in the Championship.
The Tykes, who have now won five of their last six matches, almost went behind early on when Richard Stearman’s shot was cleared off the line.
But Conor Hourihane’s strike put the visitors in front, before ex-Wolves player Adam Hammill drove home.
Saidy Janko curled in the third, before the Celtic loanee turned provider for Tom Bradshaw to strike the fourth.
While Paul Heckingbottom’s side’s remarkable start to their first season back in the second tier continues, Walter Zenga’s team have now taken one point from their last three games.
But the hosts could have taken an early lead after Adam Davies tipped over Jack Price’s second-minute free-kick and Stearman’s shot sparked panic in the area, only for Barnsley to clear their lines.
The Tykes carried more threat going forward and it told when Hourihane, the Championship’s player of the month for August, struck home after Marley Watkins’ two initial efforts were blocked.
Midfielder Hammill then quickly added a second when he was allowed into the Wolves area to shoot past Carl Ikeme, before Watkins set up debutant Janko to score only his second-ever professional goal.
Bradshaw then wrapped up proceedings from the six-yard area as the Tykes moved to within one point of leaders Huddersfield.