Her Majesty the Queen will compete in the 35th Phuket King's Cup Regatta on Saturday.
On the final day of the tournament, Her Majesty will participate as a crew member on Vayu THA72 in the IRC Zero class.
In yesterday's action, James and Kate Murray's Callisto won the day's second race in the four-boat IRC Zero class and finished second in the first race.
This sets up a thrilling final day because after each boat dropped their worst score, Ray Roberts' Team Hollywood sit atop the class with 12 points and Callisto are just two points back at 14.
Kevin Whitcraft's Vayu THA72 had a good day, winning the first race and coming in third in the second.
Vayu THA72 have 23 points heading into the final day and are third.
Steve McConaghy's Aftershock Syndicate were fourth in both races yesterday and are last in this class with 29 points.
In the five-boat Premier class, Ithinai Yingsiri's Thai vessel Pine Pacific won their sixth straight race to seal victory in this class before the final day.
Peter Cremers' Shatoosh finished second five times to secure the second spot overall.
Nick Burns' Witchcraft won the second race of the day in the seven-boat IRC One class, giving them eight of the nine races held in this class so far.
They hold a commanding lead of nine points heading into the final day of the prestigious event.