Williams' roll forced a restart of the heat, which Grant Flynn won off grid two. Cromwell's Peter Dickson produced some stunning passes in this heat to finish third from grid eight.
Strong finished third off grid seven in his second heat to secure a one-point lead with one heat remaining.
Drivers who didn't qualify last night will have the opportunity tonight when the winners of two repechage races will also make the top 20.
Those in the top 20 tonight will have three heats, and points accumulated in these three races will determine the overall winner.
It wasn't a happy start to the weekend for Hawke's Bay TQ driver Christine Bargh. She rolled during her warm-up laps and was taken to Hawke's Bay Hospital with some broken ribs and concussion.
She was one of 27 starters in the David Jones Motors New Zealand TQ Grand Prix, which like the New Zealand Super Saloon Championship, will continue tonight.
Aucklanders Lawrence Baker and Ryan Barry finished first and second respectively and Hawke's Bay's former national champion Duane Todd was third. Todd, his retired father and fellow two-time national champion Steve Todd, and cousinCraig Todd, another two-time national champion, have made the podium on 20 occasions in this event.
Craig was a convincing winner of his first heat off pole on a superb track.