The network's coverage climbed to an 18-49 demo rating of 11.2 and 35.69 million viewers on average between 8-11pm.
The figures are 8% higher than the equivalent night of Beijing's Olympics in 2008, while the London Games are 7% higher overall.
CBS's Big Brother dropped three tenths from last week to 1.9 (5.38m) at 9pm.
ABC's Wipeout fell to a new series low of 1.3 (3.83m) at 9pm.
While the Olympics remains on air, the rest of the evening continues to be dominated by repeats.
The highest ratings out of the re-runs went to The Big Bang Theory on CBS at 8pm (1.4/5.5m).