But the 23-year-old showed he can make an impact without possessing the same power bat as some of his peers, anchoring Northern Districts' innings with a perfectly-timed 55-ball knock.
He may have hit only seven boundaries and one six after coming it at No 4, but Williamson showed a knack for finding the gap and an ability to create a shot when the bowling appeared to prevent such strokeplay.
After ND elected to bat, Williamson enjoyed handy partnerships with Brad Wilson (22) and Scott Styris (29), with the latter being caught on the boundary off Ronnie Hira right when he seemed set to launch.
His dismissal brought to a close a 73-run stand with Williamson and left the junior partner to push his side closer to 200, steadily raising his strike rate as the overs ran out.
In reply, Canterbury's innings hit a serious speed bump in the third over when Australian quick Chris Tremain struck on consecutive balls to remove both openers.
Once Dean Brownlie also fell, Canterbury needed something special, and it was almost provided by Fulton. He had help from Hira, who hit 43 from 21 before being stumped from the bowling of Jono Boult, putting on a rapid 84 runs for the fourth wicket.
That wicket turned the tide back in the Knights' favour, with their prospects for victory increased by the cheap dismissals of Tom Latham and Brendon Diamanti.
With 20 needed from the final two, a stunning penultimate over from Tremain cost only five runs and produced a wicket, leaving Canterbury requiring too many from the final over.