In view of recent and foreseen technical advances in beam polarization in future proton colliders we discuss possible tests of non-standard physics at LHC and SSC assuming initial proton polarization, specifically to test for a strong electroweak sector and comparing with different extended gauge models. We examine lepton pair production, studying left-right and forward-backward asymmetries, assuming quark-antiquark and WW fusion production mechnisms. We discuss the uncertainties related to polarized proton structure functions.