High Quality Content by WIKIPEDIA articles! The 2008–09 IRB Sevens World Series was the tenth of an annual series of rugby union sevens tournaments for full national sides run by the International Rugby Board since 1999–2000. South Africa clinched the 2008-09 World Series on Day 1 of the Edinburgh Sevens, its first Series title. The defending series champions were New Zealand, who won the 2007–08 series by winning the season`s first 5 tournaments. New Zealand won the 2007–08 series with one tournament remaining after winning the Plate Final of the London leg.