The Fremantle based skipper is now three points ahead of second placed Sydneysider Evan WALKER (AUS) from the Cruising Yacht Club of Australia, with rival Sydney skipper Murray GORDON (AUS) on an equal number of wins, but more losses in third place.
MIRSKY, who is exhibiting a nice mix of confidence and conservatism in his sailing this week commented about their form, 'I guess everyone needs to keep building all the time, we haven't won anything yet, so we need to have our best for tomorrow, and we need to step it up again.'
Confirming the high standard of the competition at this event, MIRSKY said it was the last placed Swedes who gave him the toughest race, 'We stayed really close to them, because it was really, really shifty today, and we figured if we separated and did our own thing a bit they might just fluke something,' he explained.
'We stayed really close, and we just let them off once, and they gave us a really big fright, and we finished about half a boat length in front of them.'
Third placed Murray GORDON feels he still has a strong chance of making the final, saying that all his good results have been in the second round robin, which is what counts in the case of a tiebreak.
Asked if he felt under pressure he said, 'Not too much,' going on to explain, 'Because the two wins that we've had in this round robin have been against Evan WALKER and Keith SWINTON, who are both around the same points as us, if we line up on points at the end we'll get them on countback.'
The best of the overseas competitors is Britain's Ali HALL, in seventh place, who chalked up another two wins today to give himself a 6-11 scoreline, but is now out of contention for a top four place.
The light and shifty conditions at the start of the day definitely kept the crews on their toes, with the breeze only settling down late in the morning.
Thursday is the final day of the regatta, with the completion of the round robins, then the top two sail a best of three race final series.