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The UFC’s 25th anniversary event takes place at Saturday with UFC Fight Night 139. It goes down at the Pepsi Center in Denver (which hosted UFC 1 in November 1993) and airs on FS1 following early prelims on UFC Fight Pass.

A featherweight matchup with “Fight of the Year” potential serves as the main event for the card. Former title challenger Chan Sung Jung (14-4 MMA, 4-1 UFC) returns to the octagon from a nearly two-year layoff when he takes on Yair Rodriguez (10-2 MMA, 6-1 UFC), who will also be making a comeback from his longest break between fights.

In addition to the headliner, UFC Fight Night 139 features a former UFC champion, three former title challengers and a winner of “The Ultimate Fighter.” For more on the numbers, check below for 50 pre-event facts for the UFC’s 25th anniversary event.

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Main event

Jung returns to competition for the first time in 21 months and fights for just the second time since August 2013.

Jung’s 6.2-second knockout of Mark Hominick at UFC 140 is the second fastest knockout in UFC history behind Duane Ludwig’s six-second finish at UFC Fight Night 3.

Jung registered the only twister submission finish in UFC history when he defeated Leonard Garcia at UFC Fight Night 24.

Jung’s submission of Dustin Poirier at the 1:07 mark of Round 4 at UFC on FUEL TV 3 stands as the third-latest stoppage in UFC/WEC featherweight history.

Jung is the only South Korean fighter in history to challenge for a UFC title. He lost to then-champ Jose Aldo at UFC 163 in August 2013.

Rodriguez returns to competition for the first time since May 13, 2017. The 546-day layoff is the longest of his nearly seven-year career.

Rodriguez has out-struck six of the seven opponents he’s faced in UFC competition.

Rodriguez is 5-0 in UFC competition when he completes at least one takedown.

Rodriguez has received a fight-night bonus in four of his six UFC victories.

Co-main event

Donald Cerrone (33-11 MMA, 20-8 UFC), 35, is the oldest of the 24 fighters scheduled to compete at the event.

Cerrone makes his 39th UFC/WEC appearance, the most in the combined history of the two organizations.

Cerrone makes his 29th UFC appearances, tied with Michael Bisping and Jeremy Stephens for second most in company history behind Jim Miller (30).

Cerrone’s 39 appearances in UFC/WEC/PRIDE/Strikeforce competition are third most in combined organizational history behind Wanderlei Silva (40) and Dan Henderson (40).

Cerrone’s 18 appearances since 2014 in UFC competition are most in the company.

Cerrone’s 20 victories in UFC competition are tied with Bisping and Georges St-Pierre for most in company history.

Cerrone’s 26 victories in UFC/WEC/PRIDE/Strikeforce competition are the second most in combined organizational history behind W. Silva (27).

Cerrone is 5-4 since he moved up to the UFC welterweight division in February 2015.

Cerrone is 1-4 in his past five fights dating back to January 2017.

Cerrone’s 14 stoppage victories in UFC competition are tied with Vitor Belfort and Anderson Silva for the most in company history.

Cerrone’s 18 stoppage victories in UFC/WEC competition are the most in combined organizational history.

Cerrone’s 18 stoppage victories in UFC/WEC/PRIDE/Strikeforce competition are tied for third most in combined organizational history behind Mirko Filipovic (21) and W. Silva (20).

Cerrone’s six knockout victories stemming from a head kick in UFC competition are the most in company history. No one else has more than four.

Cerrone’s 17 knockdowns landed in UFC competition are third most in company history behind A. Silva (18) and Jeremy Stephens (18).

Cerrone’s nine knockdowns landed in UFC welterweight competition are tied for fourth most in divisional history behind Thiago Alves (13), Jake Ellenberger (11) and Tyron Woodley (10).

Cerrone has landed 327 leg kicks in UFC competition, the third most in company history behind Thiago Alves (333) and Joanna Jedrzejczyk (332).

Cerrone’s 18 fight-night bonuses in UFC/WEC bouts are the most in combined organizational history.

Cerrone’s 13 fight-night bonuses in UFC bouts are tied with A. Silva for third most in company history behind Nate Diaz (15) and Joe Lauzon (15).

Cerrone’s six consecutive bouts without a fight-night bonus is the longest stretch of his UFC/WEC career.

Mike Perry (11-3 MMA, 4-3 UFC) has earned 10 of his 11 career victories by knockout. He’s finished seven of those wins in Round 1.

Remaining main card

Germaine de Randamie (7-3 MMA, 4-1 UFC) returns to competition for the first time since Feb. 11, 2017. The 637-day layoff is the longest of her nearly 10-year career.

De Randamie returns to the UFC women’s bantamweight division after being stripped of the women’s featherweight title in May 2017.

De Randamie is one of six European-born champions in UFC history. Arlovski, Bas Rutten, Jedrzejczyk, Conor McGregor and Bisping also accomplished the feat.

De Randamie’s four UFC victories have come against opponents with a combined 4-10 record with the organization.

Raquel Pennington (9-6 MMA, 6-3 UFC) competes in her 10th UFC women’s bantamweight bout, tied with Amanda Nunes and Sara McMann for the most appearances in divisional history.

Pennington’s six victories in UFC women’s bantamweight competition are tied with Ronda Rousey for second most in divisional history behind Nunes (nine).

Pennington’s two submission victories in UFC women’s bantamweight competition are tied for second most in divisional history behind Rousey (three).

Pennington is one of four fighters in UFC history to earn a bulldog-choke submission victory. She accomplished the feat against Ashlee-Evans Smith at UFC 181.

Maycee Barber (5-0 MMA, 0-0 UFC), 20, is the youngest female fighter on the UFC roster and youngest of the 24 fighters scheduled to compete at the event.

Barber makes her UFC debut less than 18 months after her pro MMA debut.

Preliminary card

Ashley Yoder’s (5-4 MMA, 0-3 UFC) three-fight losing skid is the longest of her career. She hasn’t earned a victory since November 2016.

Amanda Cooper (3-4 MMA, 2-3 UFC) has suffered all four of her career losses by submission.

Cooper’s three submission losses in UFC competition are tied with Sara McMann and Alex Chambers for most of any female fighter in company history.

Chas Skelly’s (17-3 MMA, 6-3 UFC) two UFC victories in a 14-day stretch between UFC Fight Night 49 and UFC Fight Night 50 stand as the shortest period between wins in modern UFC history.

Skelly’s four submission victories in UFC featherweight competition are second most in divisional history behind Charles Oliveira (six).

Skelly’s 19-second submission of Maximo Blanco at UFC Fight Night 94 stands as the fastest submission finish in UFC/WEC featherweight history.

Skelly’s 19-second submission of Blanco stands as the eighth fastest submission finish in UFC history.

Skelly’s 19-second submission of Blanco stands as the fastest technical submission finish in UFC history.

Skelly attempted seven submissions against Sean Soriano at UFC Fight Night 50, the most in a UFC featherweight bout.

Skelly attempts 2.6 submissions per 15 minutes of fighting in UFC featherweight competition, the highest rate in divisional history.

Beneil Dariush (14-4-1 MMA, 8-4-1 UFC) enters the event on a three-fight winless skid. He hasn’t earned a victory since November 2016.

Julian Erosa (22-5 MMA, 1-1 UFC) returns to the UFC for the first time since UFC 196 in March 2016. He went 7-2 between stints with the organization.

Davi Ramos (8-2 MMA, 2-1 UFC) has earned seven of his eight career victories by stoppage. That includes both of his UFC wins.

Mark De La Rosa (10-1 MMA, 1-1 UFC) and Joby Sanchez (11-3 MMA, 1-3 UFC), who typically fight at flyweight, meet in a bantamweight bout due to the short-notice nature of their booking.

For more on UFC Fight Night 139, check out the UFC Rumors section of the site.

FightMetric research analyst and live statistics producer Michael Carroll contributed to this story. Follow him on Twitter @MJCflipdascript.