Palmquist will serve as the Nationals' opening pitcher Tuesday in Colorado, Mark Zuckerman of NatsJournal.com reports.
Palmquist is capable of more length than most openers, having struck out four over three innings of one-run ball in his last opener assignment versus the Yankees on July 10. Depending on how he fares early on during the game, Palmquist could end up being deployed as more of a piggyback starter in front of Miles Mikolas, who is lined up to pitch in bulk relief.