ExclusiveSubsea7 and Saipem battle for multibillion-dollar Petrobras subsea contractsHowever, questions remain if Italian company could proceed after being barred from signing new contracts with Brazilian state-owned playerBids in: Petrobras chief executive Jean Paul Prates.Photo: AFP/SCANPIXFabio PalmigianiSouth America CorrespondentRio de Janeiro