Chris Bartley is the first Welsh competitor in Olympic action for Great Britain on Saturday, following Friday's spectacular opening ceremony.
The Wrexham-born rower is part of the lightweight coxless men's four who enter London 2012 as a real medal hope.
The heats at Eton Dorney begin at 11:00 BST, with GB rowing off against the Czech Republic, Australia and Germany.
Great Britain's women's football team, albeit without any Welsh players, face Cameroon at the Millennium Stadium.
The GB women played their opening game in Cardiff, beating New Zealand 1-0, and will be looking to continue their good form in the Welsh capital when they kick off at 17:15 BST.
But first comes Bartley, who along with crewmates Peter Chambers, Richard Chambers and Rob Williams finished their World Cup season on a high with a gold medal at the final event in Munich.
"I'm very excited really, we couldn't have done any more, we couldn't really be better prepared up to this point," Bartley said.
"So we're confident we'll go and do a good job and if we do a good job then hopefully we'll get the right result at the end of it.
The winners of the three heats qualify automatically for the coxless fours semi-finals on 31 July, with the remaining 10 boats entering a repechage on 29 July which offers a second chance to qualify for the semis.