Plymouth held high-flying Bristol City to a goalless draw at Ashton Gate as the robins extended their unbeaten run to 18 games.
The visitors were well organised and restricted the hosts to few chances, with Matthew Hill's 44th-minute shot against the woodwork the closest City came to scoring.
Plymouth hit the same upright in the second half through Marino Keith's 65th-minute shot.
Argyle might have snatched all three points when Jason Bent shot just wide from 20 yards in the closing minutes.
Despite Brian Tinnion's probing passes from midfield, City were rarely able to test Argyle goalkeeper Romain Larrieu.