Robert is a 65-year-old African-American man who was referred to the hypertension clinic for evaluation of high blood pressure (BP) noted on an initial screening. On physical exam, his BP readings are 145/90 mm Hg and 141/96 mm Hg. He was diagnosed with diabetes 10 years ago, has a history of gout, and currently smokes 2 packs of cigarettes per day. His current medications include metformin 1,000 mg twice daily, aspirin 81 mg daily, allopurinol 300 mg daily, and rosuvastatin 20 mg daily (Learning Objectives 1-3). Laboratory findings Total cholesterol: 201 mg/dL High-density lipoprotein cholesterol: 30 mg/dL Low-density lipoprotein cholesterol: 142 mg/dL Triglycerides: 167 mg/dL

Based on the patient's blood pressure readings, Robert is best classified as having what stage of hypertension?