Thompson will start Friday's game against the Braves, Meghan Montemurro of The News Journal reports.
Jeremy Hellickson (the original Philadelphia starter) was scratched just before game time, potentially due to a brewing trade, so Thompson will be tossed into the fire less than a half an hour before the start. The 23-year-old right-hander will face off with Atlanta ace Julio Teheran in the series opener.