Danny Lennon hailed St Mirren's victory as "our day" after the 3-0 home score over Kilmarnock.
A double by Paul McGowan, the second a penalty, put the Buddies in charge and substitute Nigel Hasselbaink added a third.
When you have a group of players that actually believe in themselves and one another, they can go on to do great things together," said Lennon.
"We certainly had that in abundance. Great spirit and unity shown by us."
Visiting manager Kenny Shiels was unhappy about the penalty award with referee Stephen Finnie judging that Zdenek Kroca had handled.
Lennon felt there had certainly been contact with the defender's hand but added: "I feel for Kenny, His team hit the bar twice and he got absolutely everything off them from the first minute to the 90th minute.
"It was a wonderful atmosphere, great brand of football with both sets of teams on their day. An absolutely thrilling game.
"To get three goals and a clean sheet tops it off but more importantly, three points.
"It was our day."