Yaroslav Amosov has walked to literal hell and back to stay at the front of the line.

A veteran of the Russo-Ukrainian War, the American Top Team rep will defend his undisputed Bellator MMA welterweight championship when he faces Jason Jackson in the Bellator 301 main event on Friday at Wintrust Arena in Chicago. Amosov steps back into view with a perfect 27-0 record. He last appeared Bellator 291, where he took a five-round unanimous decision from Logan Storley on Feb. 25. Jackson, meanwhile, has rattled off six consecutive victories. The Kill Cliff Fight Club export has not fought since he was awarded a unanimous verdict over Douglas Lima at Bellator 283 in July 2022.

As Amosov and Jackson close in on their high-stakes showdown at 170 pounds, a look at some of the numbers that have accompanied them to this point:

30: Years of age for Amosov, who was born in Irpin, Ukraine, on Sept. 9, 1993.

10: Amosov wins by submission, accounting for 37% of his career total (27). His methods of choice: three rear-naked chokes, two armbars, two north-south chokes, two anaconda chokes and one brabo choke. Amosov holds nine other wins by knockout or technical knockout (33%) and eight more by decision (30%).

889: Days spent by Amosov as Bellator welterweight champion. It ranks as the second-longest title reign in the history of the division, trailing only Ben Askren (1,120 days).

5: Countries in which Amosov has plied his MMA trade. He has gone 10-0 in Russia, 8-0 in his native Ukraine, 7-0 in the United States, 1-0 in Moldova and 1-0 in Ireland.

135: Combined victories between the seven men—Storley (twice), Lima, Mark Lemminger, Ed Ruth, David Rickels, Erick Silva and Gerald Harris—Amosov has defeated since he joined the Bellator roster. They boast a .740 cumulative winning percentage at 135-47-1.

33: Years of age for Jackson, who was born on Oct. 30, 1990 in Spanish Town, Jamaica.

4: Jackson victories by knockout or technical knockout, accounting for 25% of his career total (16). His list of victims: Jordon Larson, Dhiego Lima, Victor Moreno and Jerome Buchanan.

52: Rounds completed by Jackson as a professional mixed martial artist. He has gone the distance on 11 different occasions and carries a 9-2 record in those bouts.

55: Seconds needed for Jackson to put away the aforementioned Buchanan with punches at a Fight Time show on April 27, 2012. More than 11 years later, it remains his fastest finish to date.

.742: Cumulative winning percentage between the four men—Ruth, Kyle Stewart, Hayder Hassan and Colby Covington—who have beaten Jackson. They sport a combined record of 49-17.