Yes, you may have a claim if you can prove the following elements:
The Wisconsin Supreme Court has succinctly delineated what must be shown in a malpractice action:
In an action against an attorney for negligence or violation of duty, the client has the burden of proving the existence of the relation of attorney and client, the acts constituting the alleged negligence, that the negligence was the proximate cause of the injury, and the fact and extent of the injury alleged. The last element mentioned often involves the burden of showing that, but for the negligence of the attorney, the client would have been successful in the prosecution or defense of an action.
See Lewandowski v. Continental Casualty Co., 88 Wis. 2d 271, 277, 276 N.W.2d 284, 287 (1979) (quoting 7 AM. JUR. 2D Attorneys at Law § 188, at 156 (1963))
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