Rio 2016: South's sports stars in action on Sunday
Hampshire's Justin Rose leads the field by one stroke going into the final round of the golf today in Brazil
Rose, the 2013 US Open champion, hit a six-under 65 to move to 12 under in yesterday's third round, with Sweden's Henrik Stenson (68) second.
He tees off at 14.39 this afternoon.
The first medals will be awarded in the sailing later today.
Weymouth windsurfer Nick Dempsey is guaranteed to win a silver when the men's RS:X medal race gets under way at 17.05.
And Bryony Shaw from Kent is also in action in the women's RS:X at 18.05.
Katie Clark from Reading and Olivia Federici from Farnborough compete in synchronised swimming's duet from 15:00
They've put in years of hard work with no funding to get to Rio.
Both swimmers retired after the 2013 World Championships and the sport's funding for GB athletes was cut a year later, but the two returned and successfully qualified for a place at the Games earlier this year.