Andy Murray claimed his first Olympic tennis singles victory as a noisy Wimbledon crowd helped him see off the challenge of Switzerland's Stanislas Wawrinka 6-3 6-3.
That was the first match to be played entirely under cover, and the roof was on again as heavy showers played havoc with the schedule on the second day of competition.
Murray lost in the first round in Beijing four years ago to Lu Yen-hsun of Chinese Taipei and was determined to do better this time around but Wawrinka, ranked 26th in the world and a former top-10 player, was a very tough first-round opponent.
The 27-year-old is also the reigning Olympic doubles champion with Roger Federer and carried Switzerland's flag in the opening ceremony on Friday.
There was a huge roar as Murray walked out onto Centre Court, and an even bigger one when he secured the first break of the match in the eighth game with a dinked backhand down the line.
Both players had begun a little tentatively, with Murray distracted by a flickering scoreboard and struggling with his footing, but he improved significantly as the set went on and served it out to love with an ace.
Things got even better for the third seed with another break at the start of the second, his fourth game in a row, and he saved a break point to make that five.
Murray cracked a couple of superb backhand returns as he sought a second break in the seventh game and, although Wawrinka staved off that threat, the end was not long in coming.
The Swiss found himself under pressure again in his next service game and Murray took his second match point when Wawrinka drilled a backhand wide, setting up a second-round clash with either Finn Jarkko Nieminen or Somdev Devvarman of India.