GLORY’s upcoming event in Denver, Colorado, has added a highly anticipated trilogy bout. Nieky Holzken will defend his welterweight title against Murthel Groenhart at GLORY 34 on Oct 21.

Holzken (89-11, 46 KO) last fought Groenhart (60-20-3, 34 KO) at GLORY 26: Amsterdam in December of 2015. Holzken won a razor-thin split decision, but many viewers believed that Groenhart should have been awarded the victory. It was the first time the two had fought inside the GLORY ring but their second overall fight.

After beating Groenhart last year, Holzken defended the title again against Yoann Kongolo at GLORY 29: Copenhagen this past April.

GLORY 34 Denver will air on ESPN3 at midnight ET / 9 p.m. PT on Friday, Oct. 21, and will be replayed on ESPN2 at 7 p.m. ET / 4 p.m. PT on Sunday, Oct. 23.

The card was originally headlined by featherweight champion Gabriel Varga (28-3, 8 KO) defending his belt against former lightweight champion Robin “Pokerface” van Roosmalen (35-7, 19 KO). That fight will now headline the GLORY 34: Superfight Series card, which will air on UFC Fight Pass at 9:30 PM ET.

Here’s the GLORY 34 and Superfight Series cards as they now stand:

GLORY 34 Denver

Welterweight World Title Headline Bout: Nieky Holzken (c) vs. Murthel Groenhart

Middleweight Tournament Final Bout: Winner of Bout A vs. Winner of Bout B

Middleweight Co-Headline Bout: Dustin Jacoby vs. TBA

Middleweight Tournament Semifinal Bout B: Israel Adesanya vs. Robert Thomas

Middleweight Tournament Semifinal Bout A: Yousri Belgaroui vs. Alex Pereira

GLORY 34 SuperFight Series

Featherweight World Title Bout: Gabriel Varga (c) vs. Robin Van Roosmalen

Light Heavyweight Bout: Saulo Cavalari vs. Brian Douwes

Welterweight Bout: Richard Abraham vs. Michael Mathatha

Welterweight Bout: Casey Greene vs. Tongchai Sitsongpeenong

Featherweight Bout: Justin Houghton vs. Jonathon Wyderko