Heaney (0-4) took the loss against the Nationals on Wednesday, allowing one run on four hits while striking out four over seven innings.
Heaney allowed three earned runs on three hits and two walks while striking out five batters over five innings during Friday's 8-3 loss to Atlanta. He did not factor into the decision.
Heaney escaped with a no-decision in Saturday's 9-2 loss to the Astros, allowing two runs on four hits and four walks over 3.2 innings. He struck out only one.
Heaney (0-1) took the loss Tuesday against the Rays after allowing three runs (one earned) on four hits while striking out seven in 4.2 innings. He did not issue a walk.
Heaney allowed four runs on five hits and three walks while striking out four over three innings in Wednesday's spring start against the Rockies.
Heaney allowed one hit and struck out five over three innings in an intrasquad game Friday, Kennedi Landry of MLB.com reports.
Heaney exercised his $13 million player option for 2024 on Saturday.
Heaney will start for the Rangers in Game 1 of the ALDS on Saturday at Baltimore.
Heaney is scheduled to start Saturday's game against the Mariners in Seattle, Evan Grant of The Dallas Morning News reports.
Heaney pitched 1.1 scoreless innings in relief during Monday's 5-1 win over the Angels.