Chael Sonnen’s Submission Underground returns to UFC Fight Pass on Wednesday, and once again the card features a number of MMA notables.

The closed-door submission grappling event takes place in Portland and features Bellator heavyweight champion Ryan Bader in the main event, taking on SUG absolute champion Mason Fowler. The full card streams live on UFC Fight Pass beginning at 6 p.m. ET (3 p.m. PT local time).

Bader competed earlier this month at Submission Underground 19, scoring an overtime victory over recent Bellator signee Anthony Johnson, while Fowler also competed on the same card, submitting Satoshi Ishii in overtime to defend his belt.

In the co-main event of Submission Underground 20, Japanese Olympic gold medalist judoka and longtime MMA veteran Ishii faces Australian grappling superstar Craig Jones.

Additional featured contests include 20-time UFC veteran C.B. Dollaway against 10th Planet black belt Richie Martinez, as well as Invicta FC flyweight Pearl Gonzalez taking on UFC women’s flyweight Gillian Robertson.

The complete Submission Underground 20 lineup includes:

MAIN CARD

• Champ Mason Fowler vs. Ryan Bader – for absolute championship
• Satoshi Ishii vs. Craig Jones
• C.B. Dollaway vs. Richie Martinez
• Pearl Gonzalez vs. Gillian Robertson
• Hunter Colvin vs. Gabriel Gonzaga

PRELIMINARY CARD

• Ben Egli vs. Andy Varela
• Micah Brakefield vs. Benji Silva
• Rita Gribben vs. Kristin Mikkelson
• Juan Bernardo vs. Alex Larmey
• Charlie Gilpin vs. John Simon