CBS has greenlit full seasons of frosh dramas “Vegas” and “Elementary.”

The back-nine orders for the CBS TV Studios shows were no surprise, as both have performed well for the Eye since their September debuts.

“Vegas” ranks as the season’s most-watched frosh series in total viewers, averaging 15 million viewers and 2.7 rating/8 share in adults 18-49 in the Tuesday 10 p.m. slot. “Elementary” is the No. 2 newbie in total viewers, drawing 14.3 million viewers and 3.5/10 in adults 18-49 in the tough Thursday 10 p.m. slot. Both shows have boosted CBS’ perf in their slots year-to-year.

“Each of the shows has rich characters, big stars and a unique visual style that have stood out in the crowd, helping make two of our strongest nights even stronger,” said CBS Entertainment prexy Nina Tassler in announcing the orders.

“Vegas,” the period Sin City drama toplined by Dennis Quaid, Michael Chiklis, Carrie-Anne Moss and Jason O’Mara, is exec produced by Greg Walker, Nicholas Pileggi, Cathy Konrad, Arthur Sarkissian and James Mangold. “Elementary,” a contempo spin on Sherlock Holmes starring Jonny Lee Miller and Lucy Liu, is exec produced by Rob Doherty, Sarah Timberman and Carl Beverly.