Cape Town - Following their dominant
Warren Gatland's side got the better of Joe Schmidt's charges, winning 25-7at the Principality Stadium to clinch their first Grand Slam since 2012.
As a result, leading SA bookies Sportingbet have slashed Wales' odds from 12/1 to 8/1.
The All Blacks, searching for a hat-trick of Webb Ellis Cup titles, remain favourites at 11/10, followed by England at 4/1.
Ireland have drifted out to 5/1 - with the Springboks next best at 15/2.
Wales and Australia (12/1) follow, while France (25/1), Argentina (33/1) and Scotland (40/1) complete the list of realistic contenders.
The 2019 World Cup kicks off on Friday, September 20 as hosts Japan face Russia.
The following day will see a mouth-watering encounter as the All Blacks and Springboks square off in Yokohama at 11:45 SA time.
The loser of that blockbuster is likely to face the winner of the Ireland v Scotland Pool A clash, in the quarter-finals.
The final is scheduled for Saturday, November 2.
Rugby World Cup 2019 pools:
Ireland, Scotland, Japan, Russia, Samoa
New Zealand, South Africa, Italy, Namibia, Canada
England, France, Argentina, USA, Tonga
Australia, Wales, Georgia, Fiji, Uruguay
Springboks' 2019 Rugby World Cup match schedule (SA times):
Saturday, September 21: South Africa v New Zealand, International Stadium - Yokohama (11:45)
Saturday, September 28: South Africa v Namibia, City of Toyota Stadium - Aichi (11:45)
Friday, October 4: South Africa v Italy, Shizuoka Stadium Ecopa - Shizuoka (11:45)
Tuesday, October 8: South Africa v Canada, Kobe Misaki Stadium - Kobe (12:15)