What a difference a few days make. On Wednesday, world and Olympic champion Wang Nan of China suffered the depths of despair after her humiliating defeat to a 34-year-old part-timer in the round-robin section. Last night, she was back on top of the world again as she answered her critics the best possible way by winning the US$85,000 Volkswagen Women's World Cup at Queen Elizabeth Stadium. Wang, 25, returned to glory again as she handed fast-rising Chinese star Niu Jianfeng a 4-1 defeat to give spectators two different perspectives on the world's greatest player in the space of three eventful days. This time, a near capacity crowd was treated to the Wang show everybody has come to know - the precise, clinical and professional player who won three gold medals at this year's World Championships in Paris. Whereas on Wednesday Wang performed woefully against Gao - the former China national team player who now plays only part-time for the US - last night she made up for her poor showing with a display of strength that signalled her return to the top. Her loss to Gao exposed her vulnerability, proving that even the world champion can get beaten against any player determined to beat her. But it must have also done wonders to her game because she was simply unbeatable last night. Wang showed none of the glaring misses and ineffective attacking she showed against Gao. She was, this time, a well-oiled piston again, pumping winner after winner to give little chance for 22-year-old Niu to settle into the game. Wang was back to her brilliant best and she was rewarded with her first major title since winning the singles, doubles and mixed doubles titles at the World Championships in Paris in May. 'I knew I was better than the player who lost to Gao. I think I proved it tonight,' said world number two Wang, who scooped US$28,000 first prize money to end the year on a high note. 'My defeat to Gao taught me that even I can be vulnerable. Everybody has their ups and downs but I suppose defeat sometimes can be good. 'My attitude wasn't there at the start of the tournament. I think I would have lost to any player. But I got better and better and when I reached the quarter-finals, I thought I had a chance of winning this. 'My coach helped me to get over my earlier loss. When I beat Tie Yana [Hong Kong] in the quarter-finals, my confidence was back. I was more aggressive and I was more determined to win.' Wang started slowly and twice faced an early deficit. She was down 5-1 in the opening set against Niu, last week's surprise winner at the ITTF Pro Tour finals in Guangzhou, but Wang began to piece together an all-round game that would frustrate her young opponent. Wang won the first set 11-9 and her confidence grew. She won the second set after a brilliant rally that saw her win the point with a smash that hit the edge of the table. Niu won the third set but didn't possess the killer instincts of Wang who went on to win the next two sets for a worthy 11-9, 11-9, 6-11, 11-4, 11-6 win - winning with a brilliant smash down the middle that Niu returned in the air. Wang pumped her fist again and waved to the crowd as one of the most major wins of the year began to sink in. 'My semi-final win [she won 4-0] against Zhang gave me the confidence that I needed in the final. After that match, I was ready for it.'