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Chasing pack closing on Serena, says Navratilova

AFP logoAFP 28-04-2016
KEY BISCAYNE, FL - MARCH 28: Serena Williams serves to Svetlana Kuznetsova of Russia during the Miami Open presented by Itau at Crandon Park Tennis Center on March 28, 2016 in Key Biscayne, Florida. Matthew Stockman/Getty Images/AFPKEY BISCAYNE, FL - MARCH 28: Serena Williams serves to Svetlana Kuznetsova of Russia during the Miami Open presented by Itau at Crandon Park Tennis Center on March 28, 2016 in Key Biscayne, Florida. Matthew Stockman/Getty Images/AFP © Provided by AFP KEY BISCAYNE, FL - MARCH 28: Serena Williams serves to Svetlana Kuznetsova of Russia during the Miami Open presented by Itau at Crandon Park Tennis Center on March 28, 2016 in Key Biscayne, Florida. Matthew Stockman/Getty Images/AFPKEY BISCAYNE, FL - MARCH 28: Serena Williams serves to Svetlana Kuznetsova of Russia during the Miami Open presented by Itau at Crandon Park Tennis Center on March 28, 2016 in Key Biscayne, Florida. Matthew Stockman/Getty Images/AFP

Serena Williams remains the "queen" of women's tennis but don't be surprised if she's no longer number one by the end of the year, Martina Navratilova said.

Speaking in Singapore to promote this year's WTA Finals, the 59-year-old Czech said she was pleased to see stronger competition in the women's game.

"Right now there is competition but not quite rivalry yet.

But certainly, a lot of players are stepping on Serena's heels for the year," Navratilova said. "It's not a foregone conclusion.

The last couple of years by now, we pretty much knew Serena would end up world number one at the end of the year but this year it's up in the air."

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