  We report on the mass and distance measurements of two single-lens events
from the 2015 \emph{Spitzer} microlensing campaign. With both finite-source
effect and microlens parallax measurements, we find that the lens of
OGLE-2015-BLG-1268 is very likely a brown dwarf. Assuming that the source star
lies behind the same amount of dust as the Bulge red clump, we find the lens is
a $45\pm7$ $M_{\rm J}$ brown dwarf at $5.9\pm1.0$ kpc. The lens of of the
second event, OGLE-2015-BLG-0763, is a $0.50\pm0.04$ $M_\odot$ star at
$6.9\pm1.0$ kpc. We show that the probability to definitively measure the mass
of isolated microlenses is dramatically increased once simultaneous ground- and
space-based observations are conducted.
