LAS VEGAS — The Chargers are spiraling — in all the right ways.

A laser to Keenan Allen in the back of the end zone. A pristine rainbow to Quentin Johnston way downfield.

Justin Herbert, spinning passes with mechanical precision, led his team to a 20-9 victory over the Las Vegas Raiders, directing the Chargers to a 2-0 record and a spot alone atop the AFC West.

The second half of a Monday night NFL doubleheader was a yardstick game for both teams — how good were they, truly, after their season-opening victories? — and the Raiders got a vigorous ruler-rap across the knuckles, losing to the Chargers for the fourth time in the past five meetings.

Herbert, ruthlessly effective in a win over the Kansas City Chiefs in Week 1, picked apart the Las Vegas secondary with surgical skill and usi

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