Kaylie Griffin had nine kills and six blocks, and Taylor Degnan had six kills and three blocks for Atascadero.
Jessie Featherstone had six kills and two aces, and Brooke Harbottle notched 22 assists for the Greyhounds (7-6, 0-1 PAC 8).
San Luis Obispo 3, Righetti 0
Holland Boege led the way for the Tigers with 19 kills and four blocks in the 25-17, 25-22, 25-19 win in the PAC 8 opener for both teams.
Sign Up and Save
Get six months of free digital access to The Tribune
Most of Boege's kills were set up by Merissa Brancart, who had 30 assists.
San Luis Obispo coach Marci Beddall said her team overcame a second set lull caused by a strong serving Righetti team, but stayed composed to win that game by three points.
Rilee Day had nine kills and five aces for San Luis Obispo (6-7, 1-0 PAC 8), and CeCe Devaney added seven kills and three blocks.
Morro Bay 3, Santa Maria 0
The Pirates swept 25-10, 26-24, 25-15, led by Lexi Beaman, who had 14 kills and Leila Kennedy had 10 kills.
Erin DesJardins had 28 assists in the win for Morro Bay, which plays in the Coast Union Tournament this weekend.
Nipomo 3, Cabrillo 1
The Titans won their LPL opener 25-13, 25-19, 22-25, 25-22 on the road behind Adriana Lemons, who had 28 digs.
Hope Goodall had seven kills and Savannah Rose had six kills for Nipomo (2-3, 1-0 LPL).
Coast Union 3, Valley Christian Academy 0
The Broncos swept 25-10, 25-22, 25-20, led by Gigi Stoothoff, who had 13 aces.
Xue DiMaggio had seven kills for Coast Union (2-3, 1-0 Coast Valley League).
Coastal Christian 3, Shandon 0
Reanna Iunker recorded 36 digs as Coastal Christian defeated Shandon 25-8, 26-24, 25-17.
Delaney Springer added 10 aces, and Camy DiCarlo finished with nine assists to lead the Conquerors (2-0, 1-0 CVL).
Templeton 3, Santa Ynez 0
Templeton defeated Santa Ynez 25-20, 25-13, 25-8. Emily Burns had 10 kills, Katie Bolts had seven kills and Lauren Ralston and Maddie Johnson each had four aces.
The Eagles (7-6, 1-0) head to Lompoc on Tuesday.