MK-8835-042 (B1521004) is designed to assess the safety and efficacy of an investigational drug, ertugliflozin (MK-8835, PF-04971729), in participants with type 2 diabetes and hypertension. Participants in the study will receive 1 of 5 treatments for 28 days (either placebo, 1 of 3 doses of ertugliflozin [1, 5, or 25 mg], or the approved drug hydrochlorothiazide [HCTZ]). The primary hypothesis of the study was that ertugliflozin was superior to placebo on the change from baseline in average, 24-hour systolic blood pressure (SBP) on Day 28.