The Blades had the perfect start when Alex Baptiste netted after just four minutes.
On 36 minutes, United doubled their advantage when striker Che Adams scored.
Billy Sharp wrapped up an impressive victory with a goal in the second half.
Chesterfield: Lee, Raglan, Hird, Anderson, Talbot, O’Shea,
Dimaio, Liddle, Ariyibi, Banks, Novak. Subs: Ebanks-Blake,
Humphreys, Donohue, Chapman, Simons, Orrell, Slew.
Sheff Utd: Long, Baptiste, Edgar, McEveley, Hammond, Basham,
Coutts, Flynn, Done, Sharp, Adams. Subs: Howard, Woolford,
Sammon, Calvert-Lewin, McGahey, Cuvelier, Whiteman.
Referee: Graham Scott (Oxfordshire)
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