Serena Williams has committed an undisclosed amount to Esusu, citing its mission to serve underserved populations. Esusu reports rent payments to major credit bureaus allowing renters to build a credit history. Founders say the $10 million raised in the Series A round will be used to scale the business and increase cybersecurity. Serena Williams is investing an undisclosed amount in Esusu, a fintech start-up that allows renters to build and improve credit by reporting their rent payments to credit bureaus. The tennis superstar provided the backing through her venture capital firm, Serena Ventures, as part of the start-up’s first funding round.