Chris Cunningham added 11 points and 14 rebounds for the Spartans (6-5, 1-0 WAC).
Joel Wright had 22 points and Phil Hawkins 10 in the first and last WAC opener for the Bobcats (4-9, 0-1). Texas State arrived from the Southland Conference but is bolting for the Sun Belt after its one-year stay.
San Jose State, which departs the WAC for the Mountain West next year, took advantage of 25-percent shooting (8 of 32) by Texas State in the first half to build a 32-19 lead at the break.
The Bobcats got no closer than eight in the second half as San Jose State controlled the action inside. The Spartans outrebounded Texas State 41-31 and enjoyed a 48-28 scoring advantage in the paint.
Mike Krzyzewski says he has good reason to be excited for next season thanks to a combination of Duke's incoming freshmen and a core of experienced upperclassmen.
Georgia guard Juwan Parker has been awarded a medical redshirt, leaving him with two years of eligibility, after missing the 2015-16 season with a partially torn Achilles tendon.
Forward Trevon Bluiett has withdrawn from consideration from the NBA draft and will return to Xavier for his junior season.