Watson smashed eight fours and two massive sixes in his breathtaking knock. He got to his fifty by pulling one off Wayne Parnell over deep square leg in the 10th over. Three balls later, Parnell dropped Watson while fielding for Robin Peterson at deep square leg.
The 31-year-old was finally caught in the deep off Peterson with Australia needing 38 off the last six overs.
Up till now a spectator to the Watson show, Hussey took on the bowlers and got his side over the line alongside Cameron White (21 not out).
In Image: Australia's batsman Shane Watson plays a shot as South African wicketkeeper AB de Villiers watches