Two of the world's most talented tennis players - sisters Venus and Serena Williams - will compete in a tournament in Hong Kong. World number three Venus and 20th-ranked Serena are both teenagers (Venus, 17, is the older by a year) and they are expected to be the main attractions in a four-player tournament to be held in Victoria Park in January. The Williams sisters have had considerable success since bursting on to the professional circuit a few years ago. Venus was considered the biggest prospect since Jennifer Capriati when she turned pro three years ago at the age of 14. Venus recently reached the semi-finals of the US Open singles while Serena made a very successful debut in the event by reaching the quarter-finals in the singles. Last year, Venus was the first unseeded player to reach the US Open final since 1958. Serena is already a two-time Grand Slam mixed doubles champion. Together with Belarus player Max Mirnyl, she has won this year's Australian and US Open titles. The William sisters will take centre stage in the Hong Kong event dubbed the Super Power Challenge Cup. Steffi Graf of Germany is also expected to compete, although organisers have not made an announcement yet.