When Caroline Wozniacki was enjoying her long reign as world No. 1 in 2011 there was always one blot on her copybook, one asterisk next to her career. She had yet to win one of the Grand Slam tournaments.
The closest she has come was an appearance in the final of the US Open in 2009 and a run to the semifinals of the Australian Open in 2011.
Since losing her place at the top of the tree it would be fair to say that her career has been on something of a downward spiral. She did show signs at the end of the year that her game was recovering, with a couple of tournament wins and a place back in the top 10 of the world rankings.
However, it was her performances in the Grand Slam tournaments in 2012 that were the biggest disappointments.
Instead of kicking on and looking more likely to win her first major, her results have dipped dramatically. She was knocked out in the quarterfinal at Australia before suffering third-round, first-round and first-round exits at the following Grand Slams.
Despite this loss of form I still believe that it is only a matter of time before Wozniacki wins one of the major tournaments. Because she has been so successful in many aspects of her career, it is forgotten just how young she is. At just 22 years of age she still has years of improvement ahead of her.
When you consider that someone like Heather Watson is being tipped for success in the future and has achieved not even a fraction of what Wozniacki has so far achieved, then there can only be good things for her in the future.
The best results of her career so far have come on hard courts. That is where I believe she will take her first Grand Slam. Although she has achieved some success on grass courts, particularly in her junior career when she won Wimbledon, she doesn't have the power in her game to challenge the likes of Serena Williams, Maria Sharapova or Victoria Azarenka.
I think she could be the surprise package at the first Grand Slam of the season. Nobody will be expecting her to do particularly well. But I think she may come out fighting and will certainly make the semifinals. Whether she is good enough to win at that stage is another question.
I would certainly fancy her to challenge at the US Open, where her excellent levels of fitness should give her an advantage over players at the end of a long, hard season.
2013 will be the year that Wozniacki finally fulfills her undoubted potential.