Atlanta recalled Ritchie from Triple-A Gwinnett to start Sunday against the Nationals, Mark Bowman of MLB.com reports.
The 23-year-old rookie will fill the rotation spot of Reynaldo Lopez, who landed on the injured list due to a knee issue. It'll be the eighth start and 14th MLB appearance of the campaign for Ritchie, who has a 4.50 ERA, 1.41 WHIP and 49:33 K:BB across his first 54 big-league innings.