Abu Dhabi (AFP) - Nico Rosberg posted the fasted time ahead of teammate Lewis Hamilton in the third and final free practice Saturday for the title-deciding Abu Dhabi Grand Prix.It was the first time in three attempts that Rosberg had beaten his Mercedes partner in practice. The 29-year-old German responded to Hamilton’s domination of both practice sessions on Friday with a best lap of one minute and 41.424 seconds, edging 0.369sec clear of the title favourite.Hamilton leads Rosberg by 17 points going into Sunday's race when the normal points will count double.Rosberg must win, with the British leader out of the top two, or finish second with Hamilton failing to score.