SYDNEY - Australian cycling star Simon Gerrans has broken a collarbone in a training accident and will not defend his Tour Down Under title, his team Orica GreenEdge said. Gerrans, who won a record-breaking third Tour Down Under earlier this year, will undergo surgery with his focus now shifting to the European spring classics. The 34-year-old, who has achieved a string of big wins at home and in Europe since joining Orica GreenEdge, said he was disappointed with the Australian road championships also out of the question. “Unfortunately it doesn’t matter how well the recovery goes from here, I don’t think I am going to be in any condition to be racing at a high level in January. It’s a big blow not to be able to line up in the national championships and Tour Down Under and defend my titles.”