The former Huddersfield striker, who was making his first start after signing for the club this week, sent Meadow Lane into a frenzy with a classy 30-yard strike in the first half.
It had taken the Magpies just 13 minutes to take the lead, when Mullins emphatically met a Jamal Campbell-Ryce centre, and Spencer's brilliance then put them further ahead.
Coventry tried to summon a fight-back in the second half but, despite being backed by more than 3,500 travelling supporters, they failed to trouble a Magpies defence superbly marshalled by Sheehan.
And it was the skipper who wrapped up the win from the penalty spot after Campbell-Ryce was brought down in the area towards the end.
- Sports & Recreation
- Hayden Mullins
- Alan Sheehan
- Jamal Campbell-Ryce