2003 TD Waterhouse Cup
Date	August 18–24
Edition	23rd
Category	International Series
Draw	32S / 16D
Prize money	$355,000
Surface	Hard / outdoor
Venue	Jericho, New York, United States
Champions
Singles
Paradorn Srichaphan[1]
Doubles
Robbie Koenig / Martín Rodríguez[2]
← 2002 · TD Waterhouse Cup · 2004 →

The 2003 TD Waterhouse Cup was a men's tennis tournament played on outdoor hard courts at the Hamlet Golf and Country Club in Jericho, New York in the United States and was part of the International Series of the 2003 ATP Tour. The tournament ran from August 18 through August 24, 2003. First-seeded Paradorn Srichaphan won his second consecutive singles title at the event.^[3]

Finals

Singles

Paradorn Srichaphan defeated James Blake 6–2, 6–4

• It was Srichaphan's 2nd and last singles title of the year and the 4th of his career.

Doubles

Robbie Koenig / Martín Rodríguez defeated Martin Damm / Cyril Suk 6–3, 7–6^(7–4)

• It was Koenig's 2nd title of the year and the 4th of his career. It was Rodríguez's only title of the year and the 3rd of his career.