Here is the top ten highest earning female athletes, according to Forbes.

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American tennis star, Serena Williams has topped the Forbes list of highest-earning female athletes of 2018. And the USA star is one of the aging Williams sisters, she worth: Prize money $62,000(£48,050) Endorsements $18m (£13.9m) and total is $18.062m (£14m)

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Caroline Wozniacki is a Danish professional tennis player. She is a former world No. 1 in singles. She was also the first woman from a Scandinavian country to hold the top ranking position and 20th in the Open Era. She second the forbes list of highest-earning female athletes of 2018 and her worth: prize money $6m (£4.6m) Endorsements $7m (£5.4m) and total is $13m (£10m)

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Sloane Stephens is an American professional tennis player. She achieved a career-best Women's Tennis Association ranking of No. 3 in the world in the summer of 2018. And she worth prize money $5.7m (£4.4m) Endorsements $5.5m (£4.2m) and total is $11.2m (£8.6m)

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Garbiñe Muguruza Blanco is a Spanish-Venezuelan professional tennis player and former world No. 1, currently ranked No. 7 in singles by the Women's Tennis Association. She is the No. 4 on the forbes list of highest-earning female athletes of 2018 and her worth: prize money $5.5m (£4.2m) Endorsements $5.5m (£4.2m) and total is $11m (£8.5m).

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Maria Yuryevna Sharapova is a Russian professional tennis player. A United States resident since 1994, Sharapova has competed on the WTA tour since 2001. She is the No.5 on the forbes list of highest-earning female athletes of 2018 and her worth: prize money $1m (£773,500) Endorsements $9.5m (£7.3m) and total is $10.5m (£8.1m).

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Venus Ebony Starr Williams is an American professional tennis player who is currently ranked world No. 14 in the WTA singles rankings. She is the No. 6 on the forbes list of highest-earning female athletes of 2018 and her worth: prize money $4.2m (£3.2m) Endorsements $6m (£4.6m) and total is $10.2m (£7.9m)

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Pusarla Venkata Sindhu is an Indian professional badminton player. She became the first Indian woman to win an Olympic silver medal, and one of the two Indian badminton players to ever win an Olympic medal. She is the No. 7 on the forbes list of highest-earning female athletes of 2018 and her worth: prize money $500,000 (£387,000) Endorsements $8m (£6.2m) and total is $8.5m (£6.6m). 

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Simona Halep is a Romanian professional tennis player. She is the current world No. 1 on the WTA Tour, a ranking she first achieved in October 2017. She is the No. 8 on the forbes list of highest-earning female athletes of 2018 and her worth: prize money $6.2m (£4.8m) Endorsements $1.5m (£1.1m) and total is $7.7m (£6m). 

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Danica Sue Patrick is an American former professional racing driver. She is the most successful woman in the history of American open-wheel racing—her victory in the 2008 Indy Japan 300 is the only win by a woman in an IndyCar Series race. She is the No. 9 on the forbes list of highest-earning female athletes of 2018 and her worth: prize money $3m (£2.3m) Endorsements $4.5m (£3.5m) and total is $7.5m (£5.8m). 

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Angelique Kerber is a German professional tennis player and former world No. 1, and a three time Grand Slam champion. She is the No. 10 on the forbes list of highest-earning female athletes of 2018 and her worth: prize money $3m (£2.3m) Endorsements $4m (£3.1m) and total is $7m (£5.4m).

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