LOS ANGELES -- Former All-Star outfielder Lenny Dykstra pleaded guilty Friday and could face 20 years in prison for hiding and selling sports memorabilia and other items that were supposed to be part of his bankruptcy filing.Dykstra, 49, entered his plea in U.S. District Court to one count each of bankruptcy fraud, concealment of assets and money laundering.It was the latest legal problem for Dyks