STANFORD, Calif. (AP) -- Stanford fell to UCLA 34-16 on Thursday night at Stanford Stadium, suffering its first loss to the Bruins since 2008.
The Cardinal (3-4, 2-3 Pac-12) produced a successful opening drive behind sophomore Jack West, who became Stanford's third different starting quarterback of the season, the first time that's happened since 1974.
Stanford took the opening kickoff and drove 51 yards before Jet Toner connected on a 42-yard field goal. Toner suffered an apparent injury on the ensuing kickoff and did not return. Punter Ryan Sanborn took over the kicking duties.
Trailing 14-3, Stanford's Brycen Tremayne fell on a blocked punt in the end zone to make it 14-10 and allow the Cardinal to stay within striking distance. Spencer Jorgensen got his left hand on the punt.
UCLA (2-5, 2-2 Pac-12) increased its halftime lead to 21-10 after Dorian Thompson-Robinson, who passed for 192 yards and rushed for 66, scored from one yard out.
The Bruins were balanced on offense as Joshua Kelley rushed for 176 yards, including a 54-yard touchdown run and a 53-yard gain.
Stanford's Cameron Scarlett rushed for 34 yards, including a 6-yard touchdown run. West was 15 of 32 for 143 yards. He passed for 38 yards on Stanford's first drive.
JJ Molson added field goals of 43 and 49 yards in the third quarter. UCLA outgained the Cardinal by a 455-198 margin.
Stanford next hosts Arizona on Oct. 26 at Stanford Stadium.