Pompey dismantled Cheltenham on the south coast to record their biggest League One victory of the season.
It took just five minutes for Ryan Tunnicliffe to slot them into the lead at Fratton Park after being teed-up by Colby Bishop.
And the hosts were in no mood to sit back, with Michael Jacobs and Ronan Curtis adding further goals for John Mousinho's men.
They also hit the woodwork twice before Louis Thompson's rocket wrapped up a 4-0 victory at the death.
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