The 1999 German Open was a tennis tournament played on outdoor clay courts. It was the 92nd edition of the Hamburg Masters (German Open), and was part of the ATP Super 9 of the 1999 ATP Tour. It took place at the Rothenbaum Tennis Center in Hamburg, Germany, from through 3 May through 10 May 1999.
Marcelo Ríos def. Mariano Zabaleta 6–7(5–7), 7–5, 5–7, 7–6(7–5), 6–2
- It was Marcelo Ríos' 1st title of the year, and his 13th overall. It was his 1st Masters title of the year, and his 5th overall.
Wayne Arthurs/ Andrew Kratzmann def. Paul Haarhuis / Jared Palmer 4–6, 7–6, 6–4