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Venus salutes Serena's 'amazing' spirit

Venus Williams has led the praise for her "amazing" sister Serena after the most celebrated family in world tennis cleaned up at Wimbledon again.

Just like men's champion Roger Federer, Serena is a 30-year-old whose best days, many felt, belonged in the past.

With Serena, there has also been a near-death experience to contend with. Just days after winning the 2010 Wimbledon title she stepped on some glass and injured her foot, with the subsequent complications -- including a blood clot on her lungs -- forcing her, in her own words, to her "deathbed".

Yet she is a grand slam winner again, for the 14th time in singles, after defeating Polish third seed Agnieszka Radwanska in three sets on Saturday, 6-1 5-7 6-2.

She is vowing to play on for years to come, and Venus, herself battling Sjogren's syndrome -- an autoimmune disease that effects her energy levels -- is full of admiration for her sister.

"She hasn't had an easy road," said 32-year-old Venus, whose five Wimbledon singles titles Serena has now matched.

"Things have happened in her life that you can't predict or control, so it's hard to be in that situation.

"For her to fight through and come back and be a champion, and not only that, but to have made the final of the US Open, reached the top five, all these achievements she's done that I don't think anyone else can do, is just amazing. She's such a fighter.

"You never say die. I think positivity really brought her a long way in that. I don't think either of us believe that we can be defeated by anything.

"Nothing has defeated us yet, so we're going to keep that track record."

The sisters team up in doubles at the upcoming Olympics and warmed up for their gold medal bid with the women's doubles title at Wimbledon late on Saturday evening -- their fifth in tandem at the All England Club.