Wales Sevens captain Johnathan Edwards has urged his young side to guard against complacency as they bid for a World Cup final spot.
Four victories from Wales's five pool matches against Ireland, Italy, Poland, Ukraine and Belgium would guarantee a final spot in Dubai next March.
And Llanelli Scarlets flanker Edwards believes Wales can build on their successes in Denmark and Georgia this year.
Edwards, 24, leads Wales out for the Hannover Sevens which kicks off in Germany on Saturday, and said: "There is a massive incentive for the players. We know we've got a place at the World Cup finals at stake and won't take anybody lightly this weekend.
"It does not matter whether it's the 15-man or Sevens game, it's still a chance to represent your country in a World Cup.
"It's a once-in-a-lifetime opportunity and I do not want to let it slip through our fingers."
Coach Gareth Baber has lost Sale Sharks new-boy Nick MacLeod for the trip to Germany after the former Cardiff Blues fly-half failed to recover from a knee injury.
But Edwards insists the squad are ready to rise to the challenge and seal their place against the world's best.
"I've thoroughly enjoyed my time leading the Sevens and there have been several highs and lows this season," he said.
"Reaching the semi-finals at Twickenham and the win over Samoa were great achievements. But it is a rollercoaster ride and a two-day tournament is difficult, both mentally and physically tiring but fun.
"Sevens rugby builds up your confidence and allows you to mature as a rugby player. That's the whole purpose of this style of rugby.
"But the opportunity of playing in a World Cup has driven us on. The game is slightly different but not as big a gap as many people think. Everyone thinks Sevens rugby is an open-spaced game but every team has outstanding defences now.
"It's a huge part of the game and little errors or mistakes can be the difference between winning and losing."
When the Wales squad were asked to nominate individuals who played a big part in their early playing days, Wales and Dragons full back and wing Hallam Amos thought of his former Monmouth School rugby coach John Bevan.
Sam Cross and Luke Treharne have been named as co-captains of the Wales Sevens side as head coach Gareth Williams names his 12-man squad to play in the first leg of the HSBC World Series in Dubai next weekend.
Bedwas head coach Steve Law and players Nicky Griffiths and Alun Rees extol the virtues of the close knit club as they prepare to host third place RGC 1404 - who are one place head of them on the Principality Premiership points table - on Saturday.
Many of the Wales squad have said Diolch (thank you) to someone who played an important part in their early playing days by nominating them to be invited to the Wales v South Africa match. One person, Gowerton Comprehensive geography teacher Mr Dean Mason was nominated by two of his former pupils, Dan Biggar and Sam Davies.
The second WRU disability rugby pilot has been delivered, this time in Caerphilly schools, culminating in a festival at the Caerphilly Centre of Sporting Excellence, Ystrad Mynach tomorrow. Plans are in place to set up a Disability Rugby Club in Newbridge to provide long-term playing opportunities.
WRU TV: Hear from inside the Wales camp as Neil Jenkins discusses this weekend's clash with South Africa and how the squad are looking to put in a strong performance to round of the 2016 Under Armour Series