Watch UFC 84 live online

Ultimate Fighting Championship fans can watch BJ Penn clash with Sean Sherk in the latest mixed martial arts tournament live on the internet this weekend.

UFC 84: Ill Will will be broadcast live on Saturday 24 May as a pay-per-view (PPV) event on Yahoo Sports.

It will cost $44.95 (approx £22.65) to watch the event live from Las Vegas, plus 24 hours of unlimited archive viewing. Yahoo will begin streaming the event at 7pm PDT on Saturday 24 May, which is 3am on Sunday 25 May in the UK.

UFC 84 will see incumbent lightweight champion BJ Penn take on former champion Sean Sherk. The pair have become rivals after Sherk was stripped of the title last summer following a positive test for a banned substance and Penn has been vocal about people that use performance-enhancing drugs.

Other contests on the Fight Card include Wanderlei Silva v Keith Jardine and Tito "Huntington Beach Bad Boy" Ortiz v Lyoto Machida.

It is expected to be the last fight Tito Ortiz, who has a relationship with adult film star Jenna Jameson, will make for the UFC. The former light-heavyweight champion, who has taken on Chuck 'The Iceman' Liddell and Ken Shamrock, has vowed to quit the organisation in a row over pay.

Fans can check all the latest UFC rankings, results and schedules at the Yahoo MMA website, which also has archived video clips of previous action.

Watch UFC 84 live online at www.sports.yahoo.com/ufc84