On a very competitive Wednesday where all big four networks were separated by only .3 in the 18-49 adults demo, CBS and Fox were tied while NBC had the most-watched show of the night.

Fox’s “Masterchef” (2.0/6, 4.7 million viewers) won neither the 8 nor 9 p.m. timeslot, but because it doesn’t air a show at 10 p.m. the net holds a distinct advantage in the demo race. At 8, CBS’ “Big Brother” (2.8/10, 7.7m) scored the highest demos of the evening. Net followed that up with repeats of “Criminal Minds” (1.7/5, 6.2m) and “CSI: NY” (1.4/4, 6.1m).

NBC’s “America’s Got Talent” scored a 2.8/7 in the demo and the reality skein was viewed by 10.3 million, making it tops of any other show. “Talent” grew on the lead in of “Minute to Win It” (1.7/6, 6m) and the Peacock closed its sked with a rerun of “Law & Order: SVU” (1.4/4, 6.1m).

ABC offered up the three-hour “CMA Music Festival: Country’s Night to Rock,” which registered a 1.7/5, 6m and was down 15% in the demo from last summer.

Preliminary 18-49 averages for the night: CBS, 2.0/6; Fox, 2.0/6; NBC, 1.9/6; ABC, 1.7/5; Univision, 1.7/5; CW, 0.4/1.

In total viewers: NBC, 7.5 million; CBS, 6.6 million; ABC, 6 million; Fox, 4.7 million; Univision, 4 million; CW, 1.1 million.