Ratings Chart Attack!

“Wipeout” and “America’s Got Talent” struggled in the ratings after returning from an Olympics-imposed hiatus Tuesday.

ABC’s “Wipeout,” with a 2.3 rating/7 share in the 18- to 49-year-old demographic according to preliminary Nielsen numbers, landed at its lowest rating for an original episode. “Wipeout” slipped 34% from its previous season average of first-run episodes.

Then there was the Democratic National Convention. Click here to get the skinny on how Sen. Hillary Clinton’s speech did last night in the numbers.

“Wanna Bet?” (1.5/4) was near par, and ABC placed third, tying with CBS, with a 1.6/5. And on CBS, “Big Brother” (2.3/6) stayed average.

NBC’s “Talent” (3.0/9) also slipped, hitting its lowest Tuesday night rating of the summer, down 12% from its former average. NBC ended the night in first place with a 2.6/7.

Fox (2.0/6) took second place with repeats, and The CW ended the night in last place with a 0.8/2.

What to Watch for Tonight:

—NBC, ABC, CBS: Sen. Joe Biden, D-Del., accepts his nomination as vice president tonight, day three of the Democratic National Convention, at 10 p.m. EST. Please keep track as to how many times a political pundit uses the word “zinger” in regards to Sen. Biden.