You must fill out the Application for a Pro Se Summons form and submit it to the clerk in the county where you are suing, along with payment of the court fee. Generally speaking, in the US, an opposing attorney does not owe you a duty that would give rise to a claim for legal malpractice.If an attorney acted negligently and it adversely affected your case, we will help you hold them accountable. Call us today at (212) 732-9000. Professional negligence is the most commonly pleaded cause of action against an attorney in a legal malpractice lawsuit. First of all, you can't sanction opposing counsel, only the Court can "sanction. " Next, you don't "have" the preponderance of evidence. In order to prevail in a legal malpractice action, the plaintiff must establish the existence of an attorney-client relationship. You can write a letter to the appropriate Attorney Grievance Committee or fill out and submit a form available from their websites. The plaintiff must have retained the attorney (creating the attorney-client relationship) in order to sue for legal malpractice.