Bernard Tomic joined Samantha Stosur as a first-round casualty at the Olympic tennis tournament, beaten by Japanese 15th seed Kei Nishikori in a rain-hit match decided by tie-breakers.
Nishikori won 7-6 (7-4) 7-6 (7-4) on Sunday but Tomic was not too unhappy with his performance in a match that first delayed by three hours by rain then interrupted after the first set.
"I thought I played pretty good," Tomic said.
"I didn't take my break point chances. I had four set points in the first and it would have been a different story if I had won that.
"He played better than me today," he conceded.
Lleyton Hewitt will now attempt to salvage Australia's hopes in the singles after his first round match was postponed because of the rain.
The wet weather caused problems for even the best.
Novak Djokovic had to come from a set down to beat Italy's Fabio Fognini 6-7 (9-7) 6-2 6-2.
Heavy showers throughout the day prevented all but a couple of hours of play on any court except centre court, and Djokovic on court one was also badly affected.
The second seed, looked uncomfortable with his footing on the grass and was tied at 7-7 in the first-set tie-break when the heavens opened again.
The match did not resume until Saturday evening, when Djokovic promptly lost the first two points and the set, but he began the second well and in the end the slippery conditions hampered Fognini more, with one heavy fall at the start of the third leaving the Italian struggling.
Djokovic capitalised to set up a second-round clash with either Andy Roddick of the or Slovakia's Martin Klizan.
Fifth seed Jo-Wilfried Tsonga was also in a spot of bother against Brazil's Thomaz Bellucci but came through 6-7 (7-5) 6-4 6-4.
Fourth seed David Ferrer of Spain had a much more straight forward time against Canada's Vasek Pospisil, winning 6-4 6-4.
In women's action third seed Maria Sharapova marked her Olympic debut with a thumping win but Wimbledon finalist Agnieszka Radwanska was a shock first-round loser.
The second seed had a tough draw against Julia Goerges, ranked 24th in the world, and it was the German who came through 7-5 6-7 (5-7) 6-4.
Sharapova was utterly dominant under the roof against Israel's Shahar Peer, winning 6-2 6-0.
Play was officially called off for the night just after 8pm (5am MOnday AEST) with only with a host of matches delayed until Monday.