The Fox Television network is expecting to pocket up to $1.8 billion (€1.42bn; £976m) in advertising for the fall season.
The News Corporation-owned broadcaster, which notched $1.6bn in ad commitments for fall 2005, is tipped to finish first in this year's upfront sales.
CW, the new network jointly-owned by CBS and Time Warner, and CBS are also nearing completion of upfront sales, according to media buyers.
NBC has sold more than 60% of its ad inventory but ABC lags its rivals in the pace of negotiations. The network has struck some deals with price increases of 3% to 4% in cost per thousand.
Data sourced from Wall Street Journal Online; additional content by WARC staff