  We announce the discovery of a new early-type, double-lined spectroscopic
binary in the LH 54 OB association in the LMC. We present a V light curve and
radial velocities. We investigate the possible configurations of the system,
concluding that it probably contains the most massive star measured at the
present, with a mass (in solar units) of the order of 100, while its companion
has approximately 50.
