Arizona Diamondbacks' ace Zac Gallen has returned from the injured list after nearly a month due to a right hamstring strain and delivered a stellar performance against the Oakland Athletics, allowing just one hit and one walk over six scoreless innings. Manager Torey Lovullo has adjusted the pitching schedule to ensure Gallen pitches every fifth day, allowing him to make three more starts before the All-Star break. This move bumps right-hander Slade Cecconi’s next start to the series against the San Diego Padres. Catcher Gabriel Moreno and right-hander Miguel Castro are also making progress in their recoveries, with Moreno potentially returning this week and Castro pitching two scoreless innings in a recent rookie-ball game. Additionally, center fielder Alek Thomas continues his rehab assignment at Triple-A Reno.