Amador will start at second base and bat sixth in Sunday's game against the Cardinals.
Amador has been the main beneficiary of a left heel injury to Willi Castro, which sent the infielder to the shelf Saturday. The 23-year-old will cover the keystone for a third straight game and will stay in the lineup for the fifth consecutive contest overall after going 7-for-15 with a home run, a double, a walk, three RBI and four runs since being recalled from Triple-A Albuquerque on Tuesday.