Strikeforce: Diaz vs. Cyborg was a mixed martial arts event that was held by Strikeforce on January 29, 2011 at the HP Pavilion in San Jose, California, United States.^[2]

A welterweight bout between Nate Coy and Nate Moore, which was originally scheduled to take place at ShoMMA 13, took place at this event.^[3]

Six of the preliminary card fights were streamed live on Sherdog.com.^[4]

This was the last Strikeforce event to feature amateur bouts, which were removed from all future Strikeforce cards following the promotion's sale to Zuffa, LLC in March 2011.^[5]

Strikeforce Challengers color commentator Pat Miletich filled in for the absent Gus Johnson on the live broadcast of this card.^[6]

The event drew an estimated 561,000 viewers, with a peak at 850,000 on Showtime.^[7][8][9]

Champ Nick Diaz: $150,000 (no win bonus) def. Evangelista "Cyborg" Santos: $20,000

Champ Ronaldo "Jacare" Souza: $85,000 ($15,000 win bonus) def. Robbie Lawler : $65,000

Herschel Walker: $5,000 (no win bonus) def. Scott Carson: $5,000

Roger Gracie: $75,000 (no win bonus) def. Trevor Prangley: $30,000

Nate Moore: $4,000 ($2,000 win bonus) def. Nathan Coy: $3,000

Isaiah Hill: $3,000 ($1,500 win bonus) def. Bobby Stack: $1,500

Ron Keslar: $3,000 ($1,500 win bonus) def. Eric Lawson: $1,500

Germaine de Randamie: $3,000 ($1,000 win bonus) def. Stephanie Webber: $1,000

James Terry: $3,000 ($1,500 win bonus) def. Lucas Gamaza: $1,500

Jenna Castillo: $3,000 ($1,500 win bonus) def. Charlene Gellner: $1,000