Heading into the homestretch, NBC’s coverage of the Summer Olympics remained easily the top viewing choice on Wednesday, drawing more than five times the rating of any other show on the night.

According to Nielsen, the London Games averaged a 9.2 rating/27 share in adults 18-49 and 29.1 million viewers overall from 8 to 11 p.m., down about 5% from the net’s preliminary average on the opening Wednesday of action. The 9.2 rating was double the combined deliveries of Univision, CBS, ABC, Fox and CW (4.6). Wednesday’s coverage was highlighted by track and field, women’s diving and beach volleyball.

NBC used Wednesday’s Olympics action to provide strong sampling for new Matthew Perry comedy ”Go On,” whose commercial-free pilot episode aired from 11:04 to 11:30. Preliminary Nielsens for the 11 o’clock half-hour show the comedy averaging a 6.4/20 in 18-49 and 18.5 million viewers overall, though its final numbers will be lower due to the few minutes of Olympics spill-over. ”Go On” has its regular timeslot debut on Tuesday, Sept. 11, airing in the 9 o’clock half-hour.

Elsewhere, Univision’s original novelas were Wednesday’s top-rated broadcast alternative among adults 18-49, led as usual by 10 p.m. show ”La Que No Podia Amar” (1.7/5 in 18-49, 4.7 million viewers overall).

CBS’ ”Big Brother” (1.8/6 in 18-49, 5.3 million viewers overall) was the night’s top series in demos and total viewers, though down 10% week to week. It was followed by repeats of ”Criminal Minds” (0.9/2 in 18-49, 3.9 million viewers overall) and ”CSI” (0.8/2 in 18-49, 3.9 million viewers overall).

ABC aired repeats of ”The Middle” (0.8/3 in 18-49, 3.1 million viewers overall), ”Suburgatory” (0.7/2 in 18-49, 2.5 million viewers overall) and ”Modern Family” (averaging a 1.1/3 in 18-49 and 2.8 million viewers overall for two episodes) before closing with a new ”Final Witness” (0.8/2 in 18-49, 2.8 million viewers overall).

Fox went with a rebroadcast of ”So You Think You Can Dance” (0.7/2 in 18-49, 1.9 million viewers overall).

Preliminary 18-49 averages for the night: NBC, 9.2/27; Univision, 1.4/4; CBS, 1.2/3; ABC, 0.9/3; Fox, 0.7/2; CW, 0.4/1.

In total viewers: NBC, 28.7 million; CBS, 4.4 million; Univision, 3.7 million; ABC, 2.8 million; Fox, 1.9 million; CW, 0.9 million.