Dwyer stars for Australia - London 2012 - Hockey
Australia striker Jamie Dwyer equalled his country's all-time goalscoring record with a hat-trick as the Kookaburras underlined their tag of gold medal favourites with a 6-0 win over South Africa.
The five-time world player of the year took his tally to 179 in 279 matches and although they all came from set-pieces - two penalty strokes and a short corner - the 33-year-old's influence in the overall performance was significant.
He opened the scoring after 16 minutes from the spot and, after Kieran Govers hit the post from a penalty corner, crossed for Matthew Butturini to tap in just before half-time.
After the break Chris Ciriello converted a low penalty corner drag flick and within a couple of minutes Dwyer poked home from close range at a short corner.
Then, with only the goalkeeper to beat, he was brought down by Erasmus Pieterse but picked himself up to score from the spot for his hat-trick.
Glenn Turner's 62nd-minute finish was made all the more simple by the brilliant passing move which went before it - Dwyer involved again - as Australia settled for six.
They have lost just two matches at a major tournament in the last three years.
In the later game, Great Britain's men got their Olympic campaign off to a winning start with a 4-1 victory over Argentina.
Captain Barry Middleton led the way with strikes either side of half-time before Dan Fox, with his first international goal, and Richard Smith completed the job.
Even Pedro Ibarra's late penalty corner could not give Argentina a way back into the game.
Elsewhere, The Netherlands recovered from squandering a two-goal lead to just edge out eight-time Olympic Games champions India 3-2 while Republic of Korea beat New Zealand 2-0, Spain drew with Pakistan and Germany defeated Belgium.