Eamon Zayed bagged four goals as Derry hammered Galway in Monday night's Airtricity Premier Division game to remain in third spot.
Patrick McEleney gave the Candystripes a seventh minute lead against the basement club before James McClean made it 2-0 after 23 minutes.
Zayed opened his account a minute before the break before adding Derry's fourth on 73 minutes.
The striker slotted in a penalty and completed the rout in the last minute.
League leaders Shamrock Rovers beat Bohemians 1-0 to stay three points clear of Derry and two ahead of second-placed Sligo Rovers, who won 1-0 against Dundalk.
In Monday night's other two games St Pat's Athletic won 3-1 at UCD while Drogheda United were defeated 1-0 at home by Bray Wanderers.