Alvarez went 1-for-3 with an RBI single and a run in a win over the White Sox on Wednesday.
Alvarez, who was summoned from Triple-A Las Vegas earlier in the day, drew the start at first base and delivered the Athletics' first run with his seventh-inning single. The 29-year-old rookie has performed well over a small sample in his long-awaited opportunity versus big-league pitching, as he now sports a .261 average and .320 on-base percentage during his seven total games with Oakland this season.