to Antônio Silva via doctor stoppage. Emelianenko was battered by Silva during the second round, causing his right eye to swell shut. After exiting the tournament, Emelianenko last competed against Strikeforce light heavyweight champion Dan Henderson in a heavyweight superfight, losing via first-round knockout. After the loss, Emelianenko left the promotion to finish his career overseas. Despite his 3 fight losing streak to end his Strikeforce run, all of his appearances for the promotion attracted over 500,000 viewers, among the highest ratings in Strikeforce's history on Showtime. Purchase by Zuffa, LLC On March 12, 2011, Dana White revealed on AOL to Ariel Helwani that Zuffa, LLC, the parent company of the UFC, had purchased Strikeforce. White went on to explain that Strikeforce will operate as an independent promotion and that Scott Coker would continue to run the promotion. Strikeforce CEO Scott Coker announced the return of Fedor Emelianenko on an unspecified July or August event and said that the Zuffa-owned company would continue to co-promote with M-1 Global. Following the purchase, the UFC signed many of Strikeforce's top stars and champions, such as Jason Miller, Nick Diaz, Dan Henderson, Alistair Overeem, Luke Rockhold, and Cung Le. Under Zuffa's ownership, Strikeforce made a number of changes, including reinstating elbow strikes previously barred in Strikeforce, dissolving the men's weight classes below lightweight, and ceasing promotion of amateur undercard bouts. After an extension was reached with Showtime to continue Strikeforce through 2012, the promotion's heavyweight division (sans Heavyweight Grand Prix finalists) was merged into the UFC, and the promotion's Challengers series was ended. The final Strikeforce show was Strikeforce: Marquardt vs. Saffiedine on January 12, 2013, after which the promotion was dissolved and all fighter contracts were either ended or absorbed into the UFC. Notable fighters included Daniel Cormier, Josh Barnett, Ronda Rousey and Luke Rockhold. Following a brief period away from fight promotion, former Strikeforce CEO Scott Coker would then go on to join Bellator MMA in June 2014, replacing Bjorn Rebney as its new president. Many Strikeforce fighters, as it were, went on to become Champions in the UFC. In 2015, after Luke Rockhold defeated Chris Weidman to become UFC Middleweight Champion, former Strikeforce fighters owned UFC Titles at Heavyweight, Light Heavyweight, Middleweight, and Welterweight at the same time. Rules At the time of its closure, Strikeforce employed the Unified Rules of Mixed Martial Arts, and was fought on a hexagonal