Serena savoring sweet revenge

Serena Williams ended the season on top of the world once again on Sunday as she hammered Simona Halep 6-3, 6-0 to seal a WTA Finals hat-trick and avenge her crushing loss to the Romanian.

Four days after her embarrassing 6-2, 6-0 loss to Halep, Williams served up sweet revenge to win her fifth year-end title and become the first player to clinch three in a row since Monica Seles in 1992.

The 18-time Grand Slam champion also finishes her second straight season as world No 1 and with no sign she is slowing down with Steffi Graf's Open-era record of 22 major titles in her sights.