dogged federer claims dubai crown world number one roger federer added the dubai championship trophy to his long list of successes - but not before he was given a test by ivan ljubicic.  top seed federer looked to be on course for a easy victory when he thumped the eighth seed 6-1 in the first set. but ljubicic  who beat tim henman in the last eight  dug deep to secure the second set after a tense tiebreak. swiss star federer was not about to lose his cool  though  turning on the style to win the deciding set 6-3. the match was a re-run of last week s final at the world indoor tournament in rotterdam  where federer triumphed  but not until ljubicic had stretched him all the way.  i really wanted to get off to a good start this time  and i did  and i could really play with confidence while he still looking for his rhythm   federer said.   that took me all the way through to 6-1 3-1 0-30 on his serve and i almost ran away with it. but he came back  and that was a good effort on his side.  ljubicic was at a loss to explain his poor showing in the first set.  i didn t start badly  but then suddenly i felt like my racket was loose and the balls were flying a little bit too much. and with roger  if you relax for a second it just goes very quick   he said.  after those first three games it was no match at all. i don t know  it was really weird. i was playing really well the whole year  and then suddenly i found myself in trouble just to put the ball in the court.  but despite his defeat  the world number 14 was pleased with his overall performance.  i had a chance in the third  and for me it s really positive to twice in two weeks have a chance against roger to win the match.  it s an absolutely great boost to my confidence that i m up there and belong with top-class players.