CBS won the opening Wednesday of the May sweep behind its veteran lineup while ABC’s “Modern Family” hit a season low but remained the night’s most popular program among young adults. NBC’s “Revolution,” meanwhile, improved its renewal chances by returning to the lineup with its best score since January.

Numbers were generally lower across the board, and postseason NBA and NHL action — there were three Game 7s in the opening round of the Stanley Cup playoffs, featuring teams from major-market cities New York, Los Angeles, Philadelphia and San Francisco/Oakland — likely took away some male viewers.

According to preliminary national estimates from Nielsen, CBS won kicking off the night with “Survivor” (2.2 rating/7 share in adults 18-49, 9.6 million viewers overall), which was in line with last week and led its hour. It was followed by “Criminal Minds” (2.2/6 in 18-49, 10.2 million viewers overall), which was down a tick from its prior original, and “CSI” (1.8/5 in 18-49, 9.9 million viewers overall), which was up a tick. “CSI,” which featured a back-door pilot to a possible cyber crime-related spinoff, finished first or a close second in all key categories.

At ABC, “The Middle” (1.8/6 in 18-49, 7.1 million viewers overall) was down a smidge from last week, but “Suburgatory” (1.4/4 in 18-49, 5.1 million viewers overall) and “Modern Family” (2.8/8 in 18-49, 5.1 million viewers overall) hit lows, down more than 15% from last week. They were followed by “Mixology” (1.3/4 in 18-49, 3.6 million viewers overall), which was down 13% to it lowest score to date when having an original “Modern” lead-in, and “Nashville” (1.2/4 in 18-49, 4.5 million viewers overall), which had its series low as it returned with a new episode for the first time in four weeks.

At Fox, the two-hour “American Idol” (1.8/6 in 18-49, 8.6 million viewers overall) hit a series low for a performance show, down about 10% from last week and placing third in 18-49 among series in its time period.

NBC had a pretty good night, with “Revolution” (1.4/5 in 18-49, 4.7 million viewers overall, pictured) returning after a three-week break to post its highest demo rating since late January. It was followed by “Law & Order: SVU” (1.8/5 in 18-49, 6.1 million viewers overall), which was down 14% from its prior original. And at 10 p.m., the conclusion of a crossover storyline with the previous night’s “Chicago Fire” lifted “Chicago PD” (1.9/6 in 18-49, 7.2 million viewers overall) to a 19% gain over its previous firstrun episode and a narrow demo victory over “CSI.”

CW’s “Arrow” (0.8/2 in 18-49, 2.3 million viewers overall) was up a bit from last week, while “The 100” held steady (0.6/2 in 18-49, 1.9 million viewers overall).

Preliminary 18-49 averages for the night: CBS, 2.1/6; Fox, 1.8/6; NBC, 1.7/5; ABC, 1.6/5; Univision, 1.1/3; CW, 0.7/2; Telemundo, 0.5/1.

In total viewers: CBS, 9.9 million; Fox, 8.6 million; NBC, 6.0 million; ABC, 5.5 million; Univision, 2.9 million; CW, 2.1 million; Telemundo, 1.2 million.