Hunter Dietz got punched in the mouth right away and kept throwing anyway.

The Arkansas starter watched Missouri's Jase Woita turn the very first pitch of the game into a 405-foot leadoff home run — 99 miles an hour off the bat, straight into the bullpen in left field.

It could've unraveled from there. Instead, Dietz did what good starters do and he buried the moment and got back to work.

By the time the night was finished, the Razorbacks had a 5-4 win over Missouri, a 28-15 overall record and a 10-9 mark in the SEC.

And Dietz had had one of his better outings of the season ... if you can manage to look past the first four pitches he threw.

🗣️ STEWWWWW!…