Wales 25 - 29 South Africa
The 18-year-old giant Scarlets wing, who has already been dubbed the Welsh Jonah Lomu, matched his billing with a barnstorming display.
Centre James Hook also breached South Africa's defence and fly-half Stephen Jones kicked ten points, yet Wales unforgivably surrendered a 20-9 lead established after 47 minutes.
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Hide AdThe Springboks, who launch their World Cup defence against Wales in New Zealand next September, fought back from the abyss through second-half tries from skipper Victor Matfield and replacement Willem Alberts.
Goalkicker Morne Steyn, scourge of the British and Irish Lions in South Africa last year, added 19 points through five penalties and two conversions and Wales were left to reflect on a 12th successive defeat against the Springboks.
It was also their 11th loss in 12 starts against Tri-Nations opposition under coach Warren Gatland, and while Wales will take heart from a thrilling first-half display, they painfully came up short.
Gatland's men will wonder how they conceded 17 unanswered points during nine minutes of mayhem in the second half, and although the 20,000 fans who stayed away from the Millennium Stadium - Wales were watched by under 55,000 for a second successive week - missed an absolute thriller of a match, it was South Africa who ultimately prevailed.
Gatland admitted there had been a degree of disruption caused by injuries to prop Gethin Jenkins (calf muscle) and flanker Dan Lydiate (ankle), whose withdrawals were announced an hour before kick-off.