O'Dowd, from the Royal St George Yacht Club, started well with a bullet in the first race, which only half of the 42-boat Radial fleet managed to finish. With five races sailed, his worst finish has been an eighth place.
Aidan McLaverty of XXXX sits in tenth place, with Howth's Alan Ruigrok in 13th and Royal Irish YC sailor Saskia Tidey in 26th and Roland Clill in 32nd.
The event concludes on Sunday.
Results are here.