An all Williams grand slam final looms at Wimbledon today for the first time since the 2005 US Open and with it the question of how motivated and keen one sister is to beat the other.

The final on Centre Court (3 p.m. Malta time) 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.

The younger sister won the finals between the two at Wimbledon with victories over Venus in 2002 and 2003, relinquishing her crown to Maria Sharapova in the 2004 final.

All told, Serena has the edge at 8-7 in all their meetings.

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