No. 2 Stanford (13-1, 1-0 Pac-12) began Pac-12 play with an impressive 90-69 win over California (9-3, 0-1 Pac-12) at Maples Pavilion. Stanford had not lost its opening Pac-12 game since 1994, when it lost to Washington in the then-Pac-10 opener, and Friday’s ruthless performance ensured that their impressive streak endures. Senior guard Haley Jones had a double-double to lead the team and she was…