List of champions of the 1887 U.S. National Championships (now known as the US Open). The men's tournament was held from August 22 to August 30 on the outdoor grass courts at the Newport Casino in Newport, Rhode Island. It was the 7th U.S. National Championships and the second Grand Slam tournament of the year. In 1887 the first U.S. Women's National Singles Championship was held. The event was launched at the Philadelphia Cricket Club, PA and was played after the men's tournament had ended. 17-year-old Philadelphian Ellen Hansell became the first women's champion. The men's doubles event was played at the Orange Lawn Tennis Club in South Orange, New Jersey.

Champions

Men's singles

🇺🇸 Richard Sears defeated 🇺🇸 Henry Slocum 6–1, 6–3, 6–2

Women's singles

🇺🇸 Ellen Hansell defeated 🇺🇸 Laura Knight 6–1, 6–0

Men's doubles

🇺🇸 Richard Sears / 🇺🇸 James Dwight defeated 🇺🇸 Howard Taylor / 🇺🇸 Henry Slocum 6–4, 3–6, 2–6, 6–3, 6–3