SAN DIEGO — The ghosts of the Farmers Insurance Open rattled their chains Saturday at Torrey Pines, spooky specters dotting the final-round fairways. In one direction strode Jon Rahm, the man who bagged the most recent U.S. Open on the savage South Course and won the Farmers in 2017. In another, two-time winner Jason Day eagled No. 14 to join the knot at the top. Charging up the leaderboard, 2019 winner Justin Rose. This tournament on that course is where plucky thoughts of breakthroughs go to die slow, agonizing, back-nine deaths. This is nowhere close to a maiden race in front of half-popped…