Fernandez went 3-for-4 with two home runs, four RBI and a strikeout in Tuesday's 7-5 win against the Tigers.
Starting at third base in his major-league debut, the 22-year-old put the Diamondbacks on the board during the fourth inning with a solo shot and followed up with a three-run blast in the eighth to erase a 5-4 deficit. Fernandez was expected to primarily serve as a reserve infielder for Arizona after getting promoted Monday, but the impactful debut could net him more opportunities in the short term with Pavin Smith (elbow) on the injured list.