With one month until the upfronts, bubble shows are running out of time to impress and clinch a renewal. Last night, ABC’s comedy Happy Endings gave back the ratings gains from last week to drop to a 0.8/3 and 0.6/2 in 18-49 for the two back-to-back originals at 8 PM. That was below the 0.9/3 and 0.7/3 the show logged in its first Friday outing two weeks ago, with the 0.6 rating last night marking a new low for the underrated comedy. Such numbers makes it almost impossible for ABC to justify a renewal but the show still looks like a good bet for USA should the cable network make a pickup financially feasible. Also hitting a new low was CBS’ freshman drama Vegas (0.8/3, 7 million), which held a little over half of its Undercover Boss demo lead-in (1.4/5, 7.3 million). Despite its respectable viewership, there is no scenario where the period mob drama comes back. The already renewed Blue Bloods (1.3/4, 10.3 million) was down a tenth in 18-49 while drawing the largest audience of the night by a mile.

The CW’s Nikita (0.4/1), which is eying a return for a final limited-run installment, ticked up a tenth from last week. A Carrie Diaries repeat did a 0.2, a tenth below the Cult original last Friday. The CW earlier this week yanked Cult from the schedule after first banishing the mystery series to Fridays. Giving the spot to Carrie Diaries reruns supports the speculation that the Sex And The City prequel series will likely return for a second season. NBC’s Fashion Star (0.8/3) continues its ratings yo-yo. After taking a drop last week, the reality series rebounded last night, up 33% to match its season high. Both newsmagazines last night followed repeats vs. originals last week. ABC’s 20/20 (1.5/5) was down 17%, while NBC’s Rock Center (0.8/3) was actually up a tenth.