Serena Williams remains ambitious and motivated as she prepares for another year on the WTA tour.

Williams won seven titles this past season, including the U.S. Open, but did not reach the quarterfinals of the other three Grand Slams.

In an interview with ESPNw and *ESPN The Magazine* by Chris Evert, Williams said she was looking to improve her game, including her movement.

“And I need to bring my serve back. My serve in 2014 was a little disappointing for me. I want my 2013 serve back, but a better version of that for 2015,” Williams said. “I had so many double faults this year—I was hitting, like, seven in a match, and it was driving me insane. When I'm missing, I'm thinking, 'Get it in,' which is not the right way to think. I am way too much of a perfectionist.”

Williams, who tied Martina Navratilova and Evert with 18 Grand Slam titles in 2014, also announced that she is going for Steffi Graf's haul of 22 Grand Slam titles, saying, "But right now I'm really focused on 19, which will begin in Australia. Whether I get there or not, I don't know. But I know if I get to 19, the second it happens I will be thinking of 20."

Williams was one of the three tennis players named among ESPNw's 'Impact 25' women.