A brace from Rob Duffy helped Grimsby coast past Hayes and Yeading.
Grimsby came close to opening the scoring in a match they dominated, Hayes keeper Steven Arnold tipping a Michael Coulson shot around the post.
Duffy opened the scoring when he stroked in Coulson's pinpoint cross, before the striker headed home Liam Hearn's centre for his second.
The home side were cruising, and added a third through Bradley Wood's fine 35-yard strike.
Grimsby: McKeown,Wood,Kempson,Pearson,Green,Coulson,Disley, Artus (Church 51),Makofo (Eagle 73),Duffy (Elding 57),Hearn.
Subs Not Used: Spencer,I'Anson.
Goals: Duffy 32,47,Wood 86.
Hayes & Yeading: Arnold,Argent,Cadmore,Ujah (Mackie 41),Saville, Crockford,Bentley,Williams,Soares,Collins (Wishart 60), Pacquette (Joseph-Dubois 80).
Subs Not Used: Preddie,Bayley.
Ref: R Clarke (England).