Whether a single error by trial counsel must satisfy Strickland's deficient-performance and reasonable-probability-prejudice standards or a heightened standard for single-error cases

QUESTION PRESENTED To establish that trial counsel was ineffective due to a single error, must the defendant establish that the error satisfies Strickland v. Washington’s and standards, 466 U.S. 668 (1984), or must he also satisfy a heightened standard that governs single-error cases?