A clinical performance from Northern ensured they romped to their second win in two days while the Shan Masood-led Southern Punjab crashed to another defeat in Multan.
Northern's 27-run triumph was set up by important contributions from most of the batsmen including fiery cameos from Shadab Khan and Mohammad Nawaz before Haris Rauf scythed through the chasing side with his intimidating bowling.
Northern made full use of the flat surface on offer after Shadab won the coin toss and opted to bat first.
The early loss of Zeeshan Malik was compensated with a blazing partnership between Haider Ali and Ali Imran until leg-spinner Zahid Mehmood uncoupled the duo.
Mehmood was the pick of the bowlers in the Southern Punjab attack as he executed his variations perfectly and outfoxed the Northern batsmen, who never showed restraint in their aggressive approach.
Despite Mehmood claiming three wickets in his useful spell, Northern's batters feasted on the lacklustre bowling from the rest of the SP line-up.
Savage blows from the lower-order lifted Northern past the 200-run mark for the second time in the tournament. Nawaz swatted two huge sixes his unbeaten 15-ball 31 while Asif Ali bludgeoned four boundaries in his breezy knock of 29.
Southern's chase was disrupted by a menacing attitude exhibited from Rauf as the right-arm paceman rattled the opposing team with his rapid bouncers.
Rauf inflicted a massive dent in the Southern Punjab batting in his first over by deceiving Masood with a scorching delivery that jagged back in slightly to catch his inside edge.
Although fellow opener Zeeshan Ashraf resisted with a lion-hearted 73 off 37 balls, he failed to find any support from the other end as Shadab spun a web around the rest.
Rauf tore through the lower-order by dislodging the trio of Khushdil Shah, Aamer Yamin and Bilawal Bhatti with well-directed short deliveries to finish with figures of four for 24.
Shadab was bestowed with the man of the match prize for his all-round brilliance embodied by a 14-ball 28 and three wickets for 31 in four overs.