Left: mass-luminosity diagram for the three eclipsing binaries identified in USco by K2: USco16m25 is represented as a black dot, UScoCTIO 5 as a green square, and HD 144588 as a red dot. Overplotted in blue are the solar-metallicity evolutionary tracks of the BT-Settl models (Baraffe et al. 2002) for two possible ages of 5 Myr (thick line) and 10 Myr (dashed line) for USco, the age of the Pleiades (120 Myr; long-dashed line), and the age of field dwarfs (1 Gyr; dot-dashed line). Right: effective temperature vs. luminosity diagram for the three USco systems with the same colour set as in the left panel. The blue dots on the 5 and 10 Myr isochrones correspond to masses of 1.4, 0.5, 0.3, and 0.1 M_⊙, respectively. The size of the dots for the highest mass system represents the error bars on the measurements.