Northern Ireland sprinter Jason Smyth made it safely into the final of the men's T13 100m after he won his heat last night in a time of 10.76s.
Smyth, who set the 100m world record in London four years ago, was expected to cruise through his qualifier, and he did so, finishing with the fastest time from the two heats.
The Team Ireland ace will now be expected to defend his 2012 title in today's final, which is scheduled to get under way at 3.09pm our time.
Elsewhere, both Team GB and Team Ireland were in 7-a-side football action on the first day. However, both teams got off to a disappointing start.
Great Britain lost 2-1 to hosts Brazil in the opening game of the tournament before Ireland suffered a heavy 6-0 defeat to Ukraine.
Northern Ireland's David Leavy was an unused substitute for Great Britain, who did well to stay so close to their opponents given the dominance of the Brazilians.
Toomebridge's Cormac Birt was a second-half substitute for Ireland in their heavy loss, while Glenanne man Ryan Walker was an unused replacement.
Meanwhile, County Antrim's Katie Morrow was competing for Team GB in their first match of the wheelchair basketball group stages against Canada.
The 16-year-old played the whole match, however she could not prevent Great Britain from losing their opening clash, with Canada triumphing 43-36.
The match was tight heading into the final quarter, with Canada leading by just three points (35-32) but the British side faltered in the final 10 minutes.
They will have a chance to rectify that opening loss this afternoon when they face Argentina at 2pm in their second group game.