Serena Williams receives the trophy from Billie Jean King.

Serena Williams destroyed Romania’s Simona Halep 6-3 6-0 yesterday to win the WTA Finals championship in Singapore, proving once again why she remains the most formidable force in women’s tennis.

Williams avenged her “embarrassing” loss to Halep in the group stage of the season-ending tournament with a ruthless display, overpowering her pint-sized opponent at every opportunity.

Halep shocked Williams 6-0 6-2 in the group stage of the elite event but was unable to repeat that performance as the American reminded everyone why she is the number one player in the world.

“I lost to her a couple of days ago so I knew she was capable of playing well,” Williams said.

“She started well and I knew I had to play well to beat her and I did play well.”

For Williams, it was her third successive win in the WTA Finals, second only in prestige to the four grand slams, and her fifth overall, tied for second with Steffi Graf.

Only Martina Navratilova, with eight titles, has won more, but with Williams showing no signs of slowing down at the age of 33, it is not inconceivable the American could overhaul her.

The odds were stacked against Williams winning in Singapore after she pulled out of two events in China because of a knee injury then lost to Halep in the group stages.

But, as she has shown time and time again throughout her illustrious career, Williams has a knack for raising her game when it matters.

“It was an amazing week for me so I cannot be sad that I lost,” said Halep.

Just as she did in their previous encounter, Halep made a confident start, holding her first service game to love and putting Williams under early pressure.

She broke Williams’ second service game to lead 2-1 but failed to consolidate her early advantage as the American responded by taking her game up a notch.

Williams thumped two forehands past Halep to set up her first break point then levelled the scores at 2-2 when the Romanian dumped a forehand into the net.

Staring down Halep with each point she won, a fired-up Williams quickly began to assert her authority, and broke her opponent again to lead 4-2 when Halep hit a backhand long.

A lapse in concentration cost Williams the next game as successive double-faults allowed Halep to break back but those mistakes only spurred her on and she proceeded to reel off the final eight games in a row.