The Jets opened last night's game with a 10-0 run, then edged the first quarter 26-23 after a three-pointer from Greg Meldrum. Sheffield regained control with an 11-0 run to open a 47-38 half-time lead before the Jets jolted them.
Runs of 13-2 and 8-0 gave them a 64-63 lead at the end of the third and in the closing seconds, two free-throws from Prentice McGruder gave them an 84-80 lead before Todd Cawthorn scored a free-throw. Team-mates Travis Conlan and Iain McKinney both failed with desperate three-point attempts.
Manchester kept up the pressure on Saturday with a 98-86 win over Birmingham, but scarcely could have hoped that Chester would save their title ambitions.