Great Britain's Kyle Edmund eased through the first round of the Olympics men's singles with a 6-4 6-2 win against Australian Jordan Thompson.
Edmund, 21, will play either American Jack Sock or Japan's Taro Daniel next.
But Colin Fleming and Dom Inglot are out of the men's doubles after losing 6-3 6-0 against Mexico's Santiago Gonzalez and Miguel-Angel Reyes Varela.
Heather Watson is also playing on Saturday, while defending champion Andy Murray and Jo Konta start on Sunday.
Murray, who beat Roger Federer in the final at London 2012, begins his campaign against Serbia's Viktor Troicki on Sunday.