Hertzsprung-Russell diagram for USco spectroscopic members confirmed at optical wavelengths with AAT/AAOmega in this paper and in the near-infrared with Gemini/GNIRS (Lodieu et al. 2008). Solid lines are NextGen and DUSTY isochrones at 1, 5, and 10 Myr. Dashed lines represent isomasses of 0.05, 0.03, and 0.02 M_⊙ from the DUSTY models only (Chabrier et al. 2000). Typical error bars have been added at the bottom of the plot.