Tatis (thigh) ran sprints on the field ahead of Thursday's game against the Mets, Dennis Lin of The Athletic reports.
Tatis said afterward that he was only running at about 70 percent, but it's still a significant milestone, as it's the first time he's done any sort of running since landing on the IL with a strained thigh in June. The 25-year-old still needs time to ramp up the intensity before heading out on a minor-league rehab assignment, but he remains on track to return to the Padres at some point in September.