Ryan Gandra vs Ozzy Diaz: middleweight prelim preview at UFC 331

On Saturday, September 19, 2026, UFC 331 brings Ryan Gandra and Ozzy Diaz together at middleweight on the early prelims at crypto.com Arena in Los Angeles, scheduled for 3 rounds. The card carries 13 bouts in our tables, with this pairing on the early prelims.

Tale of the tape

Ryan Gandra ("Problema"), 31, comes in at 10-1-0, listed at 6'1", with a 74.5-inch reach, fighting orthodox. Opposite him, Ozzy Diaz ("One Hit"), 35, comes in at 10-4-0, listed at 6'4", with a 79-inch reach, fighting orthodox. On the tape, Diaz has 3 inches of height and 4.5 inches of reach. Gandra is the younger by 4 years. Both fight orthodox.

• Record: Ryan Gandra 10-1-0 · Ozzy Diaz 10-4-0
• Age: Ryan Gandra 31 · Ozzy Diaz 35
• Height: Ryan Gandra 6'1" · Ozzy Diaz 6'4"
• Reach: Ryan Gandra 74.5" · Ozzy Diaz 79"
• Stance: Ryan Gandra Orthodox · Ozzy Diaz Orthodox

What the archive says

Our archive has 3 completed UFC bouts for Ryan Gandra, 3 wins. All of them came inside the distance. He last fought on Jul 11, 2026 and beat Zach Reese by KO/TKO in round 1.

• W vs Zach Reese — KO/TKO, R1 (Jul 11, 2026)
• W vs Jose Daniel Medina — KO/TKO, R1 (Feb 28, 2026)
• W vs Trent Miller — KO/TKO, R1 (Aug 27, 2025)

Our archive has 2 completed UFC bouts for Ozzy Diaz, 1 win and 1 loss. That win went the distance. Most recently he lost to Ateba Gautier by KO/TKO in round 2 on May 9, 2026.

• L vs Ateba Gautier — KO/TKO, R2 (May 9, 2026)
• W vs Djorden Santos — unanimous decision, R3 (Mar 8, 2025)

What to watch

The 4.5-inch reach gap in Ozzy Diaz's favour is the tape's headline number; it defines the range each man is working from. From our archive, Ryan Gandra has finished 3 of 3 archived wins and Ozzy Diaz has finished 0 of 1 archived win. It is scheduled for 3 rounds.

Algo lean: locked. PropBetEdge model pricing for this bout ships with UFC Pro; no pick is shown until the model has produced one.