Sanita Puspure is first of the Irish competitors out today in the women's C semi finals in the sculls at the London Olympics.
The Latvian-born rower gets started at 9.30am this morning.
In swimming, Barry Murphy takes part in the 50 metre freestyle heats just after 10am while Melanie Nocher is in the Womens 200 metres backstroke at around 11.40am.
Hannah Craig goes in the women's Kayak slalom semi-final after 2pm while Darren O'Neill fights Germany's Stefan Hartel in their round of 16 middleweight bout at around 2.45pm.
Dublin sailor, Annalise Murphy continues to lead the standings in the Women's Laser Radial class.
However, the 22-year-old has seen her lead cut to just two points after she had to settle for eighth and 19th place finishes in yesterday's two races.
Murphy has a rest day today before the action resumes on Friday.
David O'Leary and David Burrows are back on the water with two races in the Men's Star class today, the first is off just after noon and the two lie ninth overall.
Ger Owens and Scott Flanigan are out in the Mens 470 race one from 12 also, while in equestrian action Canadian-born Kildare rider Anna Merveldt goes in the individual dressage from 11am.