Lawlar (hamstring) was activated from the minor-league inured list Sept. 8, MLB.com reports.
Lawlar was sidelined in mid-June due a Grade 1 hamstring strain and an aggravation caused him to miss more time than expected. The 22-year-old is Arizona's top prospect, but he's been limited to only 15 games in a frustrating campaign and will now look to close the season strong.