From an original shortlist of seven, Goldman Sachs, Salomon Smith Barney and UBS Warburg are the frontrunners to be appointed global co-ordinator for the privatization of PSA Corp, the holding company for Port of Singapore Authority, say bankers. It is not yet known whether more than one foreign lead manager will be selected. The decision by Temasek, the Singapore government's investment arm, is likely to be announced tomorrow.