Blends containing 85 wt% of an amorphous polylactide (aPLA) with 15 wt% of three different semicrystalline PLA (cPLA) grades with different crystallizabilty were separately processed through a twin-screw extruder below the melting temperature of the cPLAs. The extrudates were either directly pelletized or pelletized after being drawn at a given drawing ratio. Small amplitude oscillatory shear rheological behavior of the samples revealed that while the rheological properties of the undrawn samples were enhanced, those of the drawn samples were much more dramatically improved with the incorporation of such a facile melt blending and drawing. In undrawn samples, the rheological properties enhancements were due to the presence of unmelted crystal clusters, which could form a solid network at low frequencies. In drawn samples, however, the pronounced rheological improvements were due to the transformation of the crystal clusters into a fiber-like oriented crystal network. Therefore, drawn samples revealed a much more pronounced viscoelastic features and a stronger network structure at low frequencies. This reinforcing behavior in both undrawn and drawn samples was even more pronounced when the cPLA with a higher degree of crystallinity and a higher melting temperature was used. In drawn samples, stress growth experiments also confirmed the formation of such oriented crystal structures during which the primary overshoot caused by the deformation of the oriented crystals could be formed again after relaxation. This was while in undrawn samples no overshoot was observed. Such oriented crystal structure could also be traced through the atomic force microscopy where the carbon nanotube was incorporated to the cPLAs as a reinforcing phase. It was also confirmed that the use of such nanocomposites could broaden the processing temperature window as the deformation and melting of the nanoparticles encapsulated by the crystallites would be more difficult. Development of such structures in drawn samples could extend the use of PLA in much wider applications without requiring expensive or incompatible additives.