Facing a run rate of 4.31, the Magicians reached their target with four overs to spare, with their eighth wicket pairing of Kirsty Nation (27no) and Gabby Sullivan (10no) putting on the decisive 41-run partnership to get their team out of trouble at 115-7.
While Watkin went wicketless with 0-30 from his seven overs, she assisted in a run out, as Rowe (2-35) and Wairarapa's Melissa Hansen (2-27) were the pick of the bowlers.
Magicians skipper Frances Mackay (33) got runs on top of the order, while Jacinta Savage (28) and Natalie Cox (36) had a key partnership through the middle of the innings, before their dismissals triggered a mini-collapse.
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In the four-day Plunket Shield match at Napier's McLean Park, the Central Stags bowled Northern Districts out for 271 in the 91st over.
Northern Districts recovered well from 105-5, their best scores coming from Bharat Popli (62), and then a crucial lower order partnership between Scott Kuggeleijn (60) and Ish Sodhi (48).
The Stags best bowlers were Hawke's Bay's Blair Tickner (4-59) and Nelson's Willem Ludick (2-51), who got the prize wicket of Mitchell Santner off a catch by Whanganui's Ben Smith.
Whanganui Collegiate old boy Tom Bruce (Taranaki) took 1-24 from his seven overs, with all six Stags bowlers picking up a scalp.