A postshared on social media purports that Tennis star Serena Williams died in a car crash recently. Verdict: False Williams has been active on Instagram since the claim has been made. Fact Check: Tennis player Naomi Osaka has chosen to work with Williams’ former coach Patrick Mouratoglou and has since won a match at the China Open, CNN Sports reported. Osaka was nervous to start a partnership with Mouratoglou, but says talking to him helped reassure her of the decision to work with him, according to the outlet. A post shared on Facebook alleges that Williams was recently reported dead after a…