Great Britain's women secured their maiden Olympic volleyball victory as they came from behind to stun African champions Algeria.
Janine Sandell and Lynne Beattie were both inspirational as the hosts won 22-25 25-19 23-25 25-19 15-8.
Team GB's next match in Pool A is on Wednesday against Italy.
Elsewhere, defending Olympic champions Brazil suffered a 3-1 defeat to the United States in a re-run of the 2008 final in Beijing.
Great Britain's win represents a major reversal of the form book, as they are ranked 69th in the world - some 53 places behind Algeria.
And when the historic point came at 00:37 as Ciara Michel won a block at the net, some of the Team GB players fell to their knees in tears.
Italy, the 2011 World Cup winners, maintained their excellent start to the tournament with a second straight win, beating Japan 3-1.
Russia also maintained their 100% winning record at London 2012 by defeating Dominican Republic 3-1.
China top Pool B ahead of United States and Brazil after overcoming Turkey 3-1, while Serbia slumped to a second straight defeat after losing 3-1 to South Korea.
Watch the deciding fifth set of Great Britain's historic victory on the BBC interactive video player