Jamie Ward's first-half shot was enough to give Chesterfield a deserved win.

The visitors dominated the first period and went ahead on 42 minutes when Ward raced on to Darren Currie's pass and fired home into the far corner.

Ward also went close with a first-half shot and Jamie Lowry saw a decent headed chance saved by Phil Barnes.

James Hunt had Grimsby's best chance but his close-range shot was blocked while Peter Till had a fine left-foot shot saved after the break.

Grimsby: Barnes, Bennett, Heywood, Newey, Hegarty, Till (Bore 90), Hunt, Heslop (North 79), Llewellyn (Boshell 63), Taylor, Butler.
Subs Not Used: Montgomery, Clarke.

Chesterfield: Carson, Downes, Page, Austin, Goodall (Picken 75), Niven, Harsley, Kerry, Currie, Lowry (Robertson 89), Ward.
Subs Not Used: Lee, Winter, Bowery.

Booked: Goodall, Harsley, Kerry.

Goals: Ward 42.

Att: 3,306.

Ref: Neil Swarbrick (Lancashire).