Washington Nationals outfielder Elijah Dukes must pay more than $40,000 in child support and alimony by next Friday or face a minimum of 90 days in jail, according to a court order filed Wednesday in a long-running civil case with his estranged wife NiShea Gilbert. Dukes earned $392,500 as a member of the Nationals last season. The 24-year-old was in Tampa, Fla., yesterday for a hearing in Hillsborough County Court.