Millers' derby triumph
A crowd of 11,143 saw the Millers dominate, with Mullins heading the only goal from David Noble’s corner kick 12 minutes into the second half.
Rotherham should have been ahead by half time after seeing Daniel Nardiello shave the outside of a post and Kari Arnason force a goal-saving block from Jack Lester.
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Hide AdThe one-way traffic continued into the second period and Alex Revell couldn’t capitalise on a one-on-one before Mullins broke the deadlock.
Chesterfield had a late effort by Armand Gnanduillet chalked off for offside and a Drew Talbot header drifted just wide but they could have few complaints at the result against a hungrier and sharper Rotherham side.
Millers: Warrington, Bradley, Ridehalgh, Davis, Mullins (capt), Frecklington, Noble, Arnason, Kearns (Cameron 90), Revell (Odejayi 84), Nardiello (Slew 86)
Chesterfield: Lee, Talbot, Smith, Trotman, Cooper, O’Shea (Gnanduillet 60), Togwell, Hird (capt), Whitaker (Brindley 71), Richards, Lester (Townsend 60)
Referee: Paul Tierney (Lancashire)
Attendance: 11,143 (2,338 away)