1999 Sybase Open
Date	February 8–14
Edition	111th
Category	ATP World Series
Draw	32S / 16D
Prize money	$325,000
Surface	Hard / indoor
Location	San Jose, USA
Venue	San Jose Arena
Champions
Singles
Mark Philippoussis[1]
Doubles
Mark Woodforde / Todd Woodbridge[2]
← 1998 · Pacific Coast Championships · 2000 →

The 1999 Sybase Open was a men's tennis tournament played on indoor hard courts at the San Jose Arena in San Jose, California in the United States and was part of the ATP World Series of the 1999 ATP Tour. It was the 111th edition of the tournament ran from February 8 through February 14, 1999. Third-seeded Mark Philippoussis won the singles title.^[3]

Mark Philippoussis defeated Cecil Mamiit, 6–3, 6–2.

• It was Philippoussis' first title of the year and the 6th of his career.

Mark Woodforde / Todd Woodbridge defeated Aleksandar Kitinov / Nenad Zimonjić, 7–5, 6–7^(3–7), 6–4.

• It was Woodforde's second title of the year and the 58th of his career. It was Woodbridge's second title of the year and the 57th of his career.