Sheffield Wednesday moved to within a point of the Championship play-off places as they came from behind to secure a resounding 4-1 win over Wolves at Hillsborough.
The visitors travelled north aiming to end a miserable run of two wins from 11 matches and Benik Afobe - a former Owls loanee - gave them hope with a 16th-minute penalty.
Carlos Carvalhal's men soon overcame that early setback, however. Fernando Forestieri fired home a penalty of his own and then put the hosts in front with a deflected half-volley.
Daniel Pudil's fine second-half strike and a late Gary Hooper goal then sealed Wednesday's first home win over Wolves since 1964, leaving them seventh in the table.
McDermott - who was appointed as Steve Clarke's successor this week - celebrated all three points thanks to Danny William's 11th-minute strike.
And there was joy for another new manager as Sean O'Driscoll saw his Walsall side defeat Port Vale 2-0 at the Bescot Stadium.
Jordan Cook scored both of the hosts' goals in the second half as they climbed back into the top two in League One.
