SYDNEY :-Australia paceman Ryan Harris will be out for six months after undergoing surgery on his right knee, Cricket Australia said on Wednesday. The 34-year-old has suffered a series of injuries throughout his test career but played a key role in Australia 's 5-0 Ashes sweep of England and the series triumph against Proteas. "Ryan underwent surgery yesterday on his right knee, which included a clean out of some loose bits of bone and removing bone spurs within the joint," team physiotherapist Alex Kountouris said.–Reuters