Ljubičić entered professional tennis in 1998, and played in the final of the ATP Challenger in Zagreb, where he lost to Alberto Berasategui. He played a number of smaller tournaments the same year, but had little success and finished the year as #293.

In 1999, his luck turned, and he won two Futures tournaments, as well as a Challenger in Besançon, France. He won another two victories Read more...

In 2004, he started the year as the runner-up to Nicolas Escude in Doha, and also played semifinals in Hamburg Masters, in Indianapolis and in the Madrid Masters. He also reached the quarterfinals in Basel and 1/8th finals in the Miami Masters.

At the 2004 Olympics, Ljubičić teamed up with Mario Ančić to win the bronze medal in tennis doubles, winning against the Indians Bhupathi Read more...

Prior to the Australian Open, Ljubičić played a tournament in Chennai, seeded 1 he was expected to do well on the hardcourts there. Playing well he reached the final and defeated Spaniard Carlos Moyà 7–6, 6–2. It proved to be a great preparation for the Australian Open.

At the 2006 Australian Open he reached the quarter-finals of a Grand Slam tournament for the first Read more...