Mass-radius diagram for detached eclipsing binaries: filled dots are primaries and asterisks are secondaries of systems with parameters determined with an accuracy better than 2%. Overplotted as red asterisks are field and young low-mass eclipsing binaries as well as four known eclipsing brown dwarfs: Corot-3 b (22 M_Jup; Deleuil et al. 2008), KELT-1 b (27.38 M_Jup; Siverd et al. 2012), and Kepler-39 b (18 M_Jup; Bouchy et al. 2011). Added in green are the only two eclipsing systems known to date in the USco association. Overplotted in red are the two components of USco16m25: the size of the symbols indicates the size of the error bars. 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).