(CNN) -- Four days after suffering a humbling defeat to Simona Halep, Serena Williams turned the tables on the Romanian to win a fifth WTA Finals title with a crushing straight sets 6-3 6-0 victory in Singapore Sunday. 

Williams had called her 6-2 6-0 reverse in round-robin group play Wednesday "embarrassing" and she set about putting the record straight in the title match. 

Fourth-ranked Halep began where she left off to take an early 2-1 lead with a break of service, but this was a very different Williams on the other side of the net. 

The world number one immediately broke back and a further break to lead 5-3 was the start of eight games in a row without reply. 

A total of 26 winners flowed from the racket of the 33-year-old American veteran -- who was winning the end of season crown for the third straight year -- the first player since Monica Seles in 1992 to achieve the feat. 

"She was playing so well at the beginning and I told myself to just relax and once I did that I started playing better and making my shots," Williams told the official WTA website. 

"I lost to her a couple of days ago so I knew she was capable of playing really well, but I knew I had to play better if I wanted to win. 

Williams' participation in the WTA Finals had been in doubt after she pulled out of a warmup tournament in China with a knee injury. 

Based on the article and the following list of answers, write a list of questions.

1. Serena Williams
2. Simona Halep
3. Romania
4. No
5. No
6. Fourth
7. Serena Williams
8. 26
9. Yes
10. Winning the end of season crown for the third straight year
11. 1992
12. America
13. No
14. She told herself to just relax and as a result started playing better and making her shots
15. WTA Finals
16. Singapore
17. No
18. She pulled out of a warmup tournament
19. China
20. Knee injury

Numbered questions:
1. Who is the article about?
2. Who was she paired with in the finals?
3. Where was the opponent from?
4. Was this the first game she had against this opponent?
5. Did she win both matches?
6. What was her opponent ranked?
7. Who won the final game?
8. How many wins did she have?
9. Did she do something special?
10. What?
11. When was the last time this was done?
12. Where is she from?
13. Did she use the same strategy for both games?
14. What did she do differently?
15. What was the name of the competition she was in?
16. Where did it happen?
17. Did people believe that she would make it to the competition?
18. Why?
19. Where was this competition?
20. Why did she leave it?