Sam Hoskins steered Northampton into an early lead but they could not build on it and Grimsby turned things around thanks to a couple of late headers, both created by the impressive Josh Emmanuel. Luke Waterfall levelled with 16 minutes to play before Glennon snatched all three points in stoppage-time. Here are our player ratings from another dispiriting afternoon at Sixfields...
5. Harvey Lintott
The pick of a below-par bunch. Kept things simple defensively and provided a real attacking threat in the second-half, creating good chances for both Koiki and Hoskins... 7 CHRON STAR MAN Photo: Pete Norton
6. Ali Koiki
Involved in both Leonard's early shot and the opening goal, but a decent first-half was not replicated in the second. Very poor defending to twice allow Emmanuel to get past him and set up the two goals... 5 Photo: Pete Norton
7. Jack Sowerby
A quiet afternoon. Apart from a brief spell shortly before Grimsby's equaliser, it never felt as if either he or the Cobblers had any control of the game... 5.5 Photo: Pete Norton
8. Marc Leonard
Well-struck early effort had to be beaten away and he produced some nice play to help create a chance for Hoskins via Lintott. Probably among the better performers on the day... 6 Photo: Pete Norton