NEW YORK (AP) — CBS is off to a rosy start as the 2012-13 season logs its first week.

The Nielsen Co. says CBS took a solid lead in prime-time viewers. It won nine of the top 20 program slots and had the two highest-rated series premieres last week.

CBS' new period-piece drama, "Vegas" debuted in sixth place, while its contemporary Sherlock Holmes whodunit, "Elementary," premiered in 10th place.

Overall for the week, ABC was runner-up in the ratings, while NBC took third place.

As usual, NBC's "Nightly News" topped the evening newscasts. But ABC's "World News" was nipping at its heels, just 42,000 viewers behind. This was the smallest gap since September 2009, when the ABC newscast most recently held first place.