Associated PressSINGAPORE (AP) - Madison Keys is the first American other than Serena and Venus Williams to earn a berth at the year-end WTA Finals in more than a decade. The last American outside of a Williams at the finals was Lindsay Davenport, a former coach to Keys, in 2005.Keys' debut in the WTA Finals, starting on Sunday, came courtesy of her winning a second career title in Birmingham, England, and reaching finals at Rome and Montreal.