In the first full week of the broadcast television summer (May 25-31), Fox topped the adults 18-49 and adults 18-34 demos and CBS won the adults 25-54 and average viewership titles.

NBC managed third place for viewers, adults 18-49 and adults 25-54, but Univision nipped ahead to place second for adults 18-34 beating all the English broadcasters but Fox. Expect continued relative strength from Univision all summer.

ABC started the summer particularly weakly, finishing fifth in the adults 18-49 and adults 18-34 demos.

Tiny Network Smackdown Update! The tables have been turned and MyNetworkTV beat the CW in every demo we track except adults 18-34 where the two tiny networks tied.

You can see past week’s broadcast network primetime weekly ratings results here.

(click chart for full sized image)

Nielsen TV Ratings Data: ©2009 The Nielsen Company. All Rights Reserved.