Maria Sharapova starts as the underdog as she takes on world number one Justine Henin in the final of the Sony Ericsson Championships

Henin is on a winning streak of 24 matches and is chasing her 10th title of 2007, but is not at her best early on

Sharapova needs eight set points in a dramatic 12th game before finally taking the opening set

And the Russian looks set for victory when she recovers from a break down in the second set

But Henin finally finds her best form to break for the second time in a row and serves out to love for one set all

Sharapova battles hard in the final set but needs a medical timeout at one stage as fatigue appears to take its toll

Henin finally seals victory after four match points and three hours, 24 minutes

Henin retains the trophy she won last year and confirms her status as the world's number one