We present optical characterization and laser results achieved with single-crystal fibers directly grown by the micro-pulling-down technique. We investigate the spectroscopic and optical quality of the fiber, and we present the first laser results. We achieved a cw laser power of $10\mathrm{W}$ at $1064\mathrm{nm}$ for an incident pump power of $60\mathrm{W}$ at $808\mathrm{nm}$ and $360\mathrm{kW}$ peak power for $12\mathrm{ns}$ pulses at $1\mathrm{kHz}$ in the Q-switched regime. It is, to the best of our knowledge, the highest laser power ever achieved with directly grown single-crystal fibers.