Goals from Jack Vale and Tom Eaves took Town to within 90 minutes of a day out at Wembley after an excellent performance. Here are our player ratings from Plough Lane...
1. Lee Burge
Not needed in the first half as Cobblers made most of the running but his services were required in the second. Good save from Maycock before Stevens tapped in, and then kept out Nkeng's curled effort. Had the final touch of the game when clawing away a last-gasp header... 7 Photo: Pete Norton
2. Jordan Willis
Captain for the night - as he often has been in this competition - and did what was needed, typically robust and competent in his defending as Wimbledon struggled to create many clear chances... 7 Photo: Pete Norton
3. Max Dyche
The move for the first goal all began with his excellent front-foot defending, stepping out to intercept a pass and then finding Jacobs, who in turn set Vale away. The highlight of a good night. Really seemed to thrive in the difficult conditions... 7.5 Photo: Pete Norton
4. Conor McCarthy
Strong performance. Calm and composed when defending and used the ball well. Had a particularly good night in the air, especially in the closing stages when Wimbledon launched balls forward and he headed most of them away. Also smuggled off the line in stoppage-time... 7.5 Photo: Pete Norton