A jubilant Maria Sharapova said she hoped her US Open victory would be the springboard to more grand slam success over the next few years.

The 19-year-old Russian produced a stunning performance to beat second seed Justine Henin-Hardenne 6-4 6-4 to win her first US Open on Saturday, adding it to the Wimbledon title she won as a 17-year-old in 2004.

"I experienced it two years ago and I knew that I wasn't done, I had a lot more in me. That was just the beginning," Sharapova said.

"This is not just preparation that happened a couple of weeks before the tournament, this is preparation that I've done ever since I was a little girl with the help of my amazing family."

When Henin-Hardenne dumped a forehand into the net to give Sharapova the victory, the Russian sunk to her knees, putting her head in her hands, almost in disbelief.

"It is absolutely incredible," she said. "The first thing that comes into (your) mind when you go down on the ground (is) that you just think of everything that you've put into this moment.

"Even though the moment is a very short time you get to be on court with that trophy, it's just so incredible."

Having won two titles this year and reached the semi-finals of two of the three grand slam events, Sharapova was among the favourites for the title before arriving in New York.

But she said victory had still taken her a little by surprise.

"I'm still pretty shocked," she said. "I'm thrilled that I got to experience another grand slam win and that it's a different grand slam - the vibe is a little bit different.

"There's definitely nothing like winning your first major. But to win your second, it's kind of like the cherry on the cake.

"But there are a lot more cherries that I'm going to put on that cake, so I'm looking forward to having them."

At the age of 19, Sharapova's best years should be ahead of her and she will be a big threat at all the grand slams over the next few years.

"At the end of the day, I'm not done yet, you know," she said.

"I feel like I'm not done. I still have years to go in my career where I feel like I am going to improve and I am going to become a better player than I am today."

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