Siena 65, Navy 56
Kyle Downey scored 19 points, Brandon Walters added 12 and Evan Hymes finished with 10 as the Saints improved to 1-0.
The Saints survived injures to Hymes and senior Owen Wignot, who had a contusion on his head after a hard fall in the first half.
Siena also dealt with foul trouble to Downey and OD Anosike.
J.J. Avila scored 19 points to lead the Midshipmen (2-1).