Heaney allowed one hit and one walk while striking out five over two scoreless innings in Sunday's spring start against the Giants.
Heaney's Cactus League debut got off to a rocky start, as the left-hander walked the first batter on four pitches and then hit a batter. He settled in after that, striking out two before inducing a groundout to avoid any damage. Heaney is expected to slot in third in the Rangers' rotation.