Karolina Pliskova says finishing the season at No. 4 doesn't bother her, even though she could have finished No.1 if she had won the WTA Finals.

The Czech did reach No. 1 following Wimbledon, but has not won a tournament since then. She fell in the semifinals of the WTA Finals to Caroline Wozniacki. That allowed Simona Halep to finish as No. 1, with Garbine Muguruza No. 2 and Wozniacki No. 3 in the rankings.

“Obviously I knew I have the chance to finish the year there, but I would still have to win two tough matches. So it was really far away from me,” Pliskova told press at Singapore. "[Halep] had a pretty good season. I would say similar as me. She made the final of Grand Slam [at the French Open], so she had some titles, some good results on big tournaments. So I think she deserve to be there. Maybe I think with Muguruza it's still close. She was playing maybe a little bit better on the bigger tournaments, but I think [Halep] had a good season.”

Neither Pliskova, Halep or Wozniacki have won a Grand Slam title. Muguruza has won two majors, including at this year's Wimbledon.

Pliskova has won nine titles, including three this season, and says she did improve, but in order to reach the top again, there are a few things she has to adapt in her game.

“I just go slowly. There is not much what you can improve, I feel there is actually a lot of things, a little bit of everything with my shots, with my serve, overall with my game, with my mental side,” Pliskova said.  “So I think there are so many things I can get better at if I get that little bit, I think I can be better next year.”