A magnetic and electric transport study of twinned and untwinned La1-xSrxMnO3 single crystals, with Sr content corresponding to a vertical phase diagram boundary (x approximate to 0.1), is presented. The phases distinctive of both phase diagram sides are consecutively detected. All magnetic, transport, and electroresistance properties are found to be anisotropic. Below the ferromagnetic ordering, T-C1=143 K, we have detected a second magnetic transition (T-C2=125 K) with an easy ferromagnetic direction along the c axis and antiferromagnetic order (AF) along the a and/or b axes. The glassylike behavior of the ferromagnetic phase disappears when the AF correlations become long ranged. The magnetocrystalline anisotropy remains below the orbital ordering transition (T-C3=73 K) with a strong anomaly in the coercive field at 30 K. The system is insulating at any temperature with different activation energies depending on the direction of the current below T-C1. The observed magnetic anisotropy below T-C2 is consistent with a homogeneous picture of the system as the ordered orbital polaron lattice proposed for the x=0.125 compound. Typical negative magnetoresistance (MR) for single crystals is detected, except at temperatures between both magnetic transitions, T-C3 < T < T-C2, where the positive MR is due to the promotion of the orbital order. Applied magnetic fields up to 14 T could not remove the orbital order while low-current densities (j=10(-8) A/cm(2) at T=20 K), when applied along the AF axes, are able to destroy the orbital order and delocalize the carriers inducing a metalliclike conductivity and reducing the resistivity by a factor of up to 10(7). The observation of anisotropic electroresistance (ER) both in continuous and pulsed regimes, consistent with magnetic and transport anisotropies, as well as the low-current densities necessary to induce the phase transition, excludes Joule heating as the origin of the discontinuous high to low resistance transitions in these single crystals.