The 35th Phuket King's Cup Regatta started yesterday off Kata Beach.
All eyes are on the four-boat IRC Zero class where Kevin Whitcraft's THA72 renew their epic battle with Ray Roberts' Team Hollywood.
Steve McConaghy's Aftershock and James and Kate Murray's Callisto round out the class.
The majority of the crew on THA72 raced as the Vayu team in the TP52 Super Series this past summer in Europe.
Day one belonged to Team Hollywood though as they won all three races in their class, taking line honours in each race as well.
Callisto rode two second place finishes to take second on the day while TH72 finished third. Aftershock finished fourth in each race.
The five-boat Premier class saw the Thai vessel Pine Pacific skippered by Ithinai Yingsiri win both races in their class.
Peter Cremers' Shatoosh were second in both races while Hans Rahmann's custom-built Yasooda were third in both races.
Bernard Huybens' Aphrodite finished fourth in both races and Viroj Nualkair's MaDuZi did not sail yesterday as they were acting as the committee boat for the dinghy races.
Nick Burns' Witchcraft had a great start in the seven-boat IRC One class winning two races. Rolf Heemskerk's The Next Factor also had a good day, winning the first race and then placing second in the next two.