SYDNEY (Agencies) - Shane Watson's injury for the second time in two ODIs has sent shockwaves in the Australian camp as it prepares for the final ODI and the forthcoming Test series against South Africa. The all-rounder collapsed with a back spasm in the middle of the fourth over before leaving the ground in discomfort during the second ODI that Australia lost in Port Elizabeth. Captain Michael Clarke was confident Watson would be fit for Friday's limited-overs match as the series is levelled at 1-1.