Northants two down and 87 from victory after being set 218 in fourth innings
Northamptonshire 256 and 131 for 2 (Procter 47*) need another 87 runs to beat Sussex 175 and 298 (Haines 103, Brown 95, Kerrigan 5-70)
Northamptonshire are poised to go second in Group Three in the LV= Insurance County Championship after they closed in on victory against Sussex at Hove.
Sussex had resumed on 142 for 4 and Haines and Brown took their fifth-wicket stand to 103 but shortly after reaching the fourth hundred of his career, Haines turned a ball from Kerrigan to midwicket. It was a somewhat tame end to a fine innings by the 22-year-old left-hander, who faced 221 balls and hit 11 fours.
Tom Taylor picked up two wickets in successive balls with Delray Rawlins bowled aiming a big drive and George Garton edging low to first slip. But Jack Carson, fresh from his maiden first-class fifty in the first innings, gave Brown admirable support either side of lunch in an eighth-wicket stand of 65 which took the score to 297.
The luckless Ben Sanderson could not break through with the second new ball but Kerrigan came to the rescue. Carson was pinned in front playing back for 35 before Taylor yorked Henry Crocombe in the next over for a duck.
That left Brown on 95 with only last man Jamie Atkins for company and he went for glory, only to be caught on the long-off boundary. The Sussex captain faced 170 balls and hit ten fours.
Although the odd ball did turn, the pitch had got easier to bat on. Sussex needed early wickets and Atkins got them a breakthrough in his first over when Ben Curran, whose nine innings this season have brought only 141 runs, was caught behind aiming an expansive drive.
Vasconcelos and Luke Procter took the score to 57 with few alarms before Haines enjoyed his second memorable moment of the day, running round from midwicket to run out Vasconcelos with a brilliant direct hit. But Procter and Rob Keogh settled the nerves with an unbroken third-wicket stand of 73 to put their side in sight of victory.
Matt Roller is an assistant editor at ESPNcricinfo. @mroller98