Many people will disagree with this statement, and I can see the reasons why. In terms of career statistics and Grand Slam wins, she still has some way to go before she can overhaul the likes of Steffi Graf, Martina Navratilova and Chris Evert.
However, without a doubt, Serena Williams is the greatest female tennis player to walk the planet.
Her record at this stage of her career is quite phenomenal. As things stand, she has won 15 Grand Slam singles titles, 13 doubles titles (all with sister Venus) and two in mixed doubles.
At the tender age of just 31 and with 2012 being one of the best years of her career, there is currently no reason to suggest that she won't win many more.
But, what sets her apart from all the other women who have played the game?
It is her ability to come back from adversity.
She has come back from the tragic death of her sister, countless injuries and a clot in her lung. She also effectively manages many other commitments away from the tennis court. And yet, she still manages to win Grand Slam trophies galore.
When people are writing her off, she is at her very best.
In the first half of 2012, she was showing signs that she could challenge for the biggest tournaments but wasn't quite able to go all the way. However, once she got to the grass of Wimbledon, all that changed. She was completely dominant as she won yet another title at SW19, before adding two more Olympic gold medals to her name and winning the U.S. Open.
Will Serena defend her Wimbledon crown in 2013?
Her Olympic record of four gold medals is just another statistic that makes her stand out from the crowd.
Although she is now 31 and relatively old compared to the next generation coming through, she shows no signs of slowing down. She has managed her career extremely well, picking and choosing her tournaments. She has been given some negative feedback for this habit, but it has the potential to increase the longevity of her career.
So what does 2013 hold for Serena? As things stand, I would make her the favourite for three out of the four Grand Slams with the French Open being the only exception. She has never been entirely comfortable on clay and has won only one title at Roland Garros back in 2002.
I expect her to be winning Grand Slams for the forseeable future.