Ordered that the order is reversed, on the facts and in the exercise of discretion, with costs, that branch of the defendant's motion which was to dismiss the complaint is granted, and the plaintiffs cross motion is denied.
It is uncontroverted that the plaintiff failed to move for leave to enter a default judgment within one year after the defendant defaulted in answering the complaint ( see CPLR 3215 [c]). Accordingly, in order to avoid the dismissal of the complaint as abandoned, he was required to demonstrate a reasonable excuse for his delay in seeking a default judgment and a meritorious cause of action ( see DuBois v Roslyn Natl. Mtge. Corp., 52 AD3d 564; County of Nassau v Chmela, 45 AD3d 722; Durr v New York Community Hosp., 43 AD3d 388; Costello v Reilly, 36 AD3d 581). Although the determination of what constitutes a reasonable excuse lies within the sound discretion of the trial court, reversal is warranted if that discretion is improvidently exercised ( see McHenry v Miguel, 54 AD3d 912; Thompson v Steuben Realty Corp., 18 AD3d 864; London v Iceland Inc., 306 AD2d 517). Here, the plaintiffs bald and unsubstantiated claim of law office failure was insufficient to explain the five-year delay in moving for leave to enter a default judgment ( see Costello v Reilly, 36 AD3d 581; Mattera v Capric, 54 AD3d 827). Accordingly, the Supreme Court improvidently exercised its discretion in denying that branch of the defendant's motion which was to dismiss the complaint as abandoned and in granting the plaintiffs cross motion for leave to enter a default judgment.