Holbeach United’s bid for Premier Division honours suffered another blow as Northampton Spencer made light of recently inactivity to take the points.
Ryan Dove gave the Millers the lead after 10 minutes.
Jake Clitheroe’s reply squared the contest in the 25th minute but Luke Stone put Spencer back ahead eight minutes before the break.
With 10 minutes to go Ryan Ansell gave the Millers breathing space and it was needed as youngster Sean Coughlan scored Holbeach’s second after 88 minutes.
Tigers boss Tom Roberts said: “It was frustrating. We gave silly goals away and missed enough chances to win 20 games, not just one.”
Meanwhile, an exciting Fernie Fields encounter saw Deeping Rangers denied in the fifth minute of stoppage-time.
They were quick out of the blocks with a first-minute Scott Coupland opener.
Sileby Rangers fought back to take the lead with goals from Merdi Meki (21 minutes) and Joe Merrill (29).
Things turned around again at the start of the second half with Deeping goals from Scott Mooney (46 minutes) and Coupland (51).
Ife Ogunbayp put Sileby on level terms after 75 minutes.
When Mooney scored his second for the visitors on 89 minutes the points looked to be heading north but Troy Johnston levelled again.
Deeping: Bircham, Flack, Smith, Hibbitt, Tinkler, Hunnings, Dunn (sub Goldson-Williams), Avis, Mooney, Coupland, Bird (sub Humphrey).
Bourne Town picked up another good result on the road to stay in sixth spot in Division One.
Craig Rook’s third-minute goal provided a great start for the Wakes and their lead was doubled by Zak Munton four minutes into the second half.
Bugbrooke St Michaels replied through Jimmy Moore after 74 minutes.