Two of Buzzetta's three scores came on second-quarter power plays helping the Spartans (3-0) take a 5-2 lead into the second half.
Returning All-American All-American Dani Curran was San Jose State's other multi-goal scorer with two. Rachel Henry's first period go-ahead score at 2-1, and one each by Anna Natalizio and Allie Stewart accounted for the rest of the Spartan scoring.
Carmen Eggert led UC Davis in scoring with two.
San Jose State's returning All-American goalkeeper Meagan Minson was credited with five saves.
Earlier in final day of the two-day, seven team tournament, San Jose State easily defeated the Fraser Valley Club of Surrey, British Columbia, 20-10, in an exhibition match.
The Spartans and #2-ranked California won all of their matches in the Spartan Invitational.
San Jose State takes its national ranking and unbeaten record to Cal next weekend for the two-day California Invitational.
Spartan Invitational women's water polo tournament
The Aquatic Center, San Jose, Calif.
January 22 results
UC Santa Barbara 16, Fraser Valley 10 (exhibition)
California 9, Pacific 4
UC Davis 13, Santa Clara 6
San Jose State 20, Fraser Valley 10 (exhibition)
California 11, UC Santa Barbara 7
Pacific 10, Santa Clara 9
San Jose State 8, UC Davis 6
Spartan Invitational Records
San Jose State 3-0
UC Davis 2-2
UC Santa Barbara 0-3
Santa Clara 0-3