Although the rules of conduct include a rule that requires competence, it is not all that common to see discipline imposed for a single instance of incompetent representation. Thus, it is a little surprising to hear about a new case by the Nebraska Supreme Court in which it suspended an attorney who had failed to provide competent representation in a civil rights lawsuit. The case is available here. The attorney had never handled a similar lawsuit in the past, failed to associate with more experienced counsel and failed to adequately prepare for the case. The attorney did not contest the charges.
Thanks to Mike Frisch of the Legal Profession Blog for the information and link.