Williams play seventh grand slam final

By Rex Gowar

LONDON (Reuters) - An all Williams grand slam final looms at Wimbledon on Saturday for the first time since the 2005 U.S. Open and with it the question of how motivated and keen one sister is to beat the other.

The final on Centre Court (1300 GMT) at the All England Club has the potential to be great with both Williams sisters, holder and four times champion Venus and twice winner Serena, in excellent form.

The sisters, with seventh seed Venus, at 28 older by 15 months than the sixth-seeded Serena, insist that throughout their parallel careers each has always done her utmost to outdo the other.

Serena said sibling rivalry motivated her to want everything her sister had achieved and more when she spoke after her semi-final victory over Zheng Jie of China on Thursday.

Venus was more vehement when she said after beating Russian Elena Dementieva, that she found suggestions that there might be a family agreement on the outcome of their matches offensive and an insult to her professionalism.

Dementieva was quoted as saying the outcome would be a family decision, no doubt meaning it would be settled within the family because a Williams would win come what may.

However, Dementieva said she would find it hard to play against a family member.