Frank Shamrock (23-10-2) announced his retirement from mixed martial arts midway through last night's (June 26) Strikeforce: "Fedor vs. Werdum" Showtime telecast from the HP Pavilion in San Jose, California.

"The Legend" was last seen getting hammered into a TKO stoppage by current Strikeforce Welterweight Champion Nick Diaz. It was his second straight defeat after coughing up the promotion's 185-pound title to San Shou Striker Cung Le.

Shamrock was the first fighter to hold the UFC Middleweight Championship (later renamed the UFC Light Heavyweight Championship), held the interim King of Pancrase title in addition to the WEC Light Heavyweight Championship, and in his final run, the Strikeforce Middleweight Championship.

Unless he pulls a Randy Couture and decides to come back and take on a new generation, the 37-year-old middleweight is calling it a career. Where does he rank on your all-time list?

Let's hear your thoughts, Maniacs.