Martin Siese and crew made a clean sweep of the honours during the weekend's Fitted Dinghy racing in Mangrove Bay to blow the race for the coveted Coronation Cup wide open.

Siese and crew of Peter Bromby, Donnie Canton, Lisa Spurling, Mike Finegan and Jeremy Burnham sailed host dinghy, Challenger II to convincing wins during Sunday's opening two races but were pushed all the way in the day's finale by Contest III and Elizabeth II.

Challenger II won the first race by a comfortable four-boat margin despite giving up valuable ground raising the spinnaker on the final downwind after previous leader Elizabeth II was forced to retire with a broken jib halyard.

"We managed to tie the spinnaker in knots and the only thing we didn't do was rip it. We had a slew of problems and did not get the spinnaker up and pulling until halfway down the leg," Siese explained.

Second place honours went to Contest III followed by Jordy Walker's Bloodhound in third.

There was also no shortage of drama in the second race as Siese lost crewman Canton who fell overboard on the last downwind leg but still had enough momentum to collect a second bullet of the day and set himself up for the coveted treble.

"In dinghy racing you don't have to finish with the same number of crew you started out with," Seise said.

There was also a slice of luck to Challenger II's second win of the day win as Contest III's gamble to switch to their larger number two sails backfired after the winds filled in and made their task of getting around the course all the more daunting.

"As it turned out we were a little lucky because the breeze came up. I think Contest III made the right choice but was unlucky because the breeze filled in a bit more and he (Somers Kempe) struggled a bit more in the second race," added Siese.

"Anytime there was a lull he (Kempe) was going fast but whenever a big puff came in it was the boats with the smaller sails that were going faster. Most of us were conservative in our sail choices and came out with fairly small number three sails to start out with."

Elizabeth II rebounded strongly from her first race breakdown to finish second while Contest III completed the three and two course in third.

The day's final and most exciting race saw Challenger II round the final downwind leg and hold off a strong late surge from Contest III and Elizabeth II to complete the sweep and replace Contest III at the top of the Coronation Cup points standings after two races.

Walker's Bloodhound led the fleet in the early stages before the lead swapped hands multiple times to set up an exciting three-boat battle to the finish between Challenger II, Contest III and Elizabeth II.

Contest III eventually finished second behind the host dinghy with Elizabeth coming in third.

The victorious Siese now hopes he and his crew can continue their winning ways in what promises to be a fierce battle for bragging rights at the end of the campaign.

"It's certainly all still very close and we were somewhat fortunate to get three firsts because the racing was very tight," he added .