The junior faced No. 6 Taylor Walsh of Indiana and showed no signs of timidity, taking down Walsh within the first 20 seconds. Dieringer let him up just 10 seconds later and closed the period with a takedown to lead, 4-1, heading into the second.
Dieringer opened the second with an escape and went on to land two more takedowns that period. He didn't slow down and added two more takedowns before the final whistle to earn a 14-7 victory and another first-place trophy.
"He really controlled the match," coach John Smith. "That kid had some dangers to him, and obviously that's a great thing if you look at his career; this season - staying out of those positions. I think the good thing was he made the adjustment in the middle of the match and went to his doubles and was in on his far legs and seemed to have a lot of success, as you saw, with 14 points."
Two wins by fall on Thursday sent Dieringer to the quarterfinals, where he took on No. 9 Jackson Morse of Illinois. Dieringer earned a third bonus-point win of the tournament, picking up an 18-6 major decision in that bout. After that, he topped No. 5 Bo Jordan of Ohio State with a decisive 6-1 win in the semifinals.
"From the standpoint of just dominance, he's up there," Smith said. "If you look at his overall record this year and his number of major decisions, tech fall, pins, I'm not sure anybody equals it right now. From the standpoint of this particular season, he's very dominant."
Dieringer finishes the season with a perfect 33-0 record, marking the 14th undefeated season in school history. Of his 33 wins, 27 came with bonus points attached, giving him an 81.8 percent bonus-point win percentage. His 2014-15 campaign put him ninth all-time at OSU in both single-season bonus-point wins and single-season bonus point-win percentage.
Dieringer's win also improved his unbeaten streak to 49 matches, dating back to January of 2014.
The Cowboy won his first NCAA title in 2014 at 157 pounds, when he earned a 13-4 major decision over Dylan Ness of Minnesota in the title bout.
"Coach always told me the second one's harder," Dieringer said. "So I feel like this one feels a lot more special to me. Just coming back and going undefeated ... And moving up, too, which made it a lot harder. So I feel like I did pretty good this season."
Under the direction of Coach John Smith, 29 Cowboys have earned NCAA titles and 111 have earned All-America status.
The Cowboys finished the NCAA Championships in seventh place with 65 points. Ohio State won its first team national title.