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.
Maryland point guard Melo Trimble, considered a lock to leave the program before struggling in the second half last season, has withdrawn from the NBA draft and will return for his junior season.
Louisville's Chinanu Onuaku, who recently underwent a medical procedure to correct a heart rhythm issue detected during the combine, will keep his name in the NBA draft pool.
Andrew White III will return to the Nebraska men's basketball team next season after removing his name from the NBA draft.