Nashville (6-1-9, 27 points), which played its first-ever match in Canada, is 4-0-4 during its current run.
The draw also extended Toronto's (3-8-5, 14 points) own unbeaten stretch to five games. The Reds are now 2-0-3 under interim head coach Javier Perez, who replaced Chris Armas on July 4.
Neither side was able to generate much offensively or sustain much pressure in the attacking third early on, with a slight edge to Toronto on possession.
The home squad was the first to break through the scoreless deadlock. Defender Omar Gonzalez finished off a set piece when he redirected Yeferson Soteldo's kick with a header to give Toronto a 1-0 lead in the 20th minute.
Both sides had a chance to take the lead heading into halftime in first-half stoppage time but neither could capitalize. Canadian defender Alistair Johnston's header from the top of the goalmouth was denied by the leg of goalkeeper Alex Bono and moments later, Nashville keeper Joe Willis snared Toronto midfielder Marky Delgado's quick strike from the top of the box.
Nashville came close to taking the lead early in the second half. In the 52nd minute, Romney tried to connect with Castellanos but his behind-the-back pass rolled wide left of the net and six minutes later, Hany Mukhtar just missed the timing to connect on a header.
In the 75th minute, Bono got his hands on an attempt by C.J Sapong to keep the score level.