Fosu and Pinnock struck in either half while Jay Williams scored an own goal on his return. Here are our player ratings from Sixfields...
5. Nesta Guinness-Walker
More of the same. Three league starts in and he's yet to show any sign of a weakness. Both defensively solid and technically sound. Athletic, physical and no slouch either. What a pick up... 7.5 Photo: Pete Norton
6. Ben Fox
He's the man you want in your midfield against possession-based opponents. Disciplined and tenacious in his defensive work to shut down passing lanes and snap into tackles when required. Superb pass to Fosu in the build-up to the third... 8 Photo: Pete Norton
7. Samy Chouchane
Wonderful through ball should have led to a goal but did have an assist a few minutes later when his short corner was hammered home by Fosu. Put in a good shift out of possession and popped some good passes through the lines... 7.5 Photo: Pete Norton
8. Cameron McGeehan
Led the press alongside the front three. It was case of nearly but not quite in front of goal. Excellent defending prevented him from converting Roberts' early cross and then a loose touch at the key moment was costly in the second half, although it did allow Pinnock to fire home... 7 Photo: Pete Norton