One of the cornerstone events of the UFC’s yearly calendar takes place Saturday. This year’s International Fight Week festivities are capped off by UFC 239, which takes place at T-Mobile Arena in Las Vegas and airs on pay-per-view following prelims on ESPN and ESPN+/UFC Fight Pass.

In the main event, one of the sport’s pound-for-pound greats returns when Jon Jones (24-1 MMA, 18-1 UFC) puts his light heavyweight title on the line in a matchup with Brazilian powerhouse Thiago Santos (21-6 MMA, 13-5 UFC).

The co-headliner sees two-division UFC champion Amanda Nunes (17-4 MMA, 10-1 UFC)
put her women’s bantamweight belt up for grabs when she takes on Holly Holm (12-4 MMA, 5-4 UFC).

For more on the numbers behind the UFC 239 main-card lineup, check below for 60 pre-event facts.

* * * *

Main event

Jones owns or is on the verge of owning numerous key UFC records. Check out his complete stat sheet to see where he stands in company history.

Santos is 3-0 since he moved up to the light heavyweight division in September.

Santos’ three-fight UFC winning streak in light heavyweight competition is tied for the third longest active streak in the division behind Dominick Reyes (four) and Aleksandar Rakic (four).

Santos has earned 16 of his 21 career victories by stoppage. That includes 11 of his 13 UFC wins.

Santos’ 11 knockout victories in UFC competition are tied with Anderson Silva and Anthony Johnson for second most in company history behind Vitor Belfort (12).

Santos’ 11 knockouts since 2014 in UFC competition are most in the company.

Santos’ eight knockout victories in UFC middleweight competition are tied with Silva for most in divisional history.

Santos’ four knockout victories stemming from kicks in UFC competition are tied with Belfort, Lyoto Machida and Edson Barboza for second most in company history behind Donald Cerrone (seven).

Santos’ nine knockdowns landed in UFC middleweight competition are tied for third most in divisional history behind Silva (13) and Nate Marquardt (12).

Co-main event

Nunes is one of four simultaneous two-division champions in UFC history. Daniel Cormier, Conor McGregor and Henry Cejudo also accomplished the feat.

Nunes is one of seven fighters in UFC history to win titles in two weight classes. Cormier, McGregor, Cejudo, Georges St-Pierre, B.J. Penn and Randy Couture also accomplished the feat.

Nunes’ three consecutive UFC title defenses are most among current champions.

Nunes has defeated five fighters who once held an undisputed UFC belt, the second most of any active fighter in the organization behind Jones (six).

Nunes competes in her 11th UFC women’s bantamweight bout, the most appearances in divisional history.

Nunes’ 10 victories in UFC competition are second most for any female in company history behind Jessica Andrade (11).

Nunes’ nine victories in UFC women’s bantamweight competition are the most in divisional history.

Nunes’ eight-fight UFC winning streak in women’s competition is the longest in company history.

Nunes’ seven-fight UFC winning streak in women’s bantamweight competition is the longest active streak in the division.

Nunes has earned 15 of her 17 career victories by stoppage. That includes eight of her 10 UFC wins.

Nunes’ seven stoppage victories in UFC women’s bantamweight competition are most in divisional history.

Nunes’ six first-round finishes in UFC/Strikeforce women’s bantamweight competition are second most in combined divisional history behind Ronda Rousey (seven).

Nunes’ five knockout victories in UFC women’s bantamweight competition are the most in divisional history.

Nunes lands 51.3 percent of all her significant strike attempts in UFC women’s bantamweight competition, the third highest rate in divisional history behind Lina Lansberg (58 percent) and Andrade (55.9 percent).

Nunes’ 14-second knockout of Julia Budd at Strikeforce Challenger 13 is the fastest knockout in UFC/Strikeforce women’s history.

Nunes’ victory at the 2:36 mark of Round 5 at UFC 224 marked the second latest stoppage in a women’s UFC title fight – behind only Miesha Tate’s win at the 3:30 mark of Round 5 vs. Holm at UFC 196.

Nunes’ three fight-night bonuses for UFC women’s bantamweight fights are tied for second most in divisional history behind Rousey (seven).

Holm, 37, is the oldest of the 24 fighters scheduled to compete at the event.

Holm, 37, becomes the oldest female to compete in a UFC championship fight.

Holm competes in her fifth UFC title fight. She’s 1-3 in previous championship bouts.

Holm can become the first female to have multiple UFC title reigns in a single weight class.

Holm returns to competition for the first time since June 9, 2018. The 392-day layoff is the longest of her UFC career.

Holm returns to the UFC women’s bantamweight division after a one-fight stint at featherweight.

Holm is 2-4 in her past five UFC appearances dating back to her title-winning knockout of Rousey at UFC 193 in November 2015.

Holm’s two head-kick knockout victories in UFC competition are the most of any female in company history.

Holm’s three fight-night bonuses for UFC women’s bantamweight fights are tied for second most in divisional history behind Rousey (seven).

Featured bout

Jorge Masvidal (33-13 MMA, 10-6 UFC) is 5-4 since he returned to the welterweight division is July 2015.

Masvidal has earned all four of his UFC welterweight stoppage victories by knockout.

Masvidal is one of five fighters in UFC history to finish a bout by submission at the 4:59 mark of Round 2. He accomplished the feat at UFC on FOX 8.

Ben Askren (19-0 MMA, 1-0 UFC) is a former ONE Championship and Bellator welterweight champion.

Askren’s 19-fight MMA winning streak is tied for third longest among active UFC fighters behind Khabib Nurmagomedov (27) and Alexey Kunchenko (20).

Askren is one of six fighters in UFC history to earn a submission victory with a bulldog choke. He accomplished the feat at UFC 235.

Remaining main card

Jan Blachowicz’s (23-8 MMA, 6-5 UFC) is one of two light heavyweights in UFC history to earn a knockout stemming from a body kick. He accomplished the feat at UFC Fight Night 53.

Blachowicz lands 52 percent of his takedown attempts in UFC light-heavyweight competition, the second highest rate in divisional history behind Machida (65 percent).

Luke Rockhold (16-4 MMA, 6-3 UFC) returns to competition for the first time since Feb. 10, 2018. The 511-day layoff is the longest of his nearly 12-year career.

Rockhold moves up to the light heavyweight division for the first time. He previously competed at middleweight, where he won UFC and Strikeforce titles.

Rockhold has alternated wins and losses over his past four fights. He was defeated in his most recent bout at UFC 221.

Rockhold has earned 14 of his 16 career victories by stoppage. That includes all six of his wins under the UFC banner.

Rockhold’s 13 stoppage victories in UFC/Strikeforce middleweight competition are the most in combined divisional history.

Rockhold’s nine first-round stoppage victories in UFC/Strikeforce competition since the inception of the five-minute round are tied for second most in the combined history of the two organizations behind former UFC heavyweight champ Frank Mir (10).

Diego Sanchez (29-11 MMA, 18-11 UFC) competes in his 30th UFC bout, tied for the third most appearances in company history behind Cerrone (32) and Jim Miller (32).

Sanchez is the only active UFC fighter who was a cast member on “The Ultimate Fighter 1.”

Sanchez is one of two fighters in UFC history to compete in four different weight classes. Kenny Florian also accomplished the feat.

Sanchez is 2-1 since he returned to the UFC welterweight division in November 2017. He’s 11-5 at the weight under the UFC banner.

Sanchez’s 12 victories by decision in UFC competition are tied with St-Pierre for most in company history.

Sanchez has fought to a decision 19 times in UFC competition, the most in company history.

Sanchez has absorbed 1,239 total head strikes in his UFC career, the second most in company history behind Penn (1,358).

Michael Chiesa (15-4 MMA, 8-4 UFC) was successful in his welterweight debut at UFC 232 in December.

Chiesa’s five submission victories via rear-naked choke in UFC competition are tied for third most in company history behind Demian Maia (eight) and Florian (seven).

Chiesa has completed at least one takedown against 11 of his 12 UFC opponents.

For more on UFC 239, check out the UFC schedule.

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