INDIAN WELLS, CA - MARCH 18: Serena Williams of USA is congratulated by Agnieszka Radwanska of Poland after she won in straight sets during day twelve of the BNP Paribas Open at Indian Wells Tennis Garden on March 18, 2016 in Indian Wells, California. (Photo by Julian Finney/Getty Images)
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INDIAN WELLS, CA - MARCH 18: Serena Williams during reacts to a lost point in her straight set win over Agnieszka Radwanska of Poland during day twelve of the 2016 BNP Paribas Open at Indian Wells Tennis Garden on March 18, 2016 in Indian Wells, California. (Photo by Harry How/Getty Images)
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INDIAN WELLS, CA - MARCH 18: Agnieszka Radwanska of Poland in action against Serena Williams of USA during day twelve of the BNP Paribas Open at Indian Wells Tennis Garden on March 18, 2016 in Indian Wells, California. (Photo by Julian Finney/Getty Images)
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INDIAN WELLS, CA - MARCH 18: Agnieszka Radwanska of Poland in action against Serena Williams of USA during day twelve of the BNP Paribas Open at Indian Wells Tennis Garden on March 18, 2016 in Indian Wells, California. (Photo by Julian Finney/Getty Images)
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INDIAN WELLS, CA - MARCH 18: Serena Williams of USA reacts after defeating Agnieszka Radwanska of Poland in straight sets during day twelve of the BNP Paribas Open at Indian Wells Tennis Garden on March 18, 2016 in Indian Wells, California. (Photo by Julian Finney/Getty Images)
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Getty Images Sport Julian Finney