With CBS laffer ”Two and a Half Men” stuck in repeat mode, ABC continues to take advantage: The net rolled over the competition on Monday behind ”Dancing With the Stars” and drama ”Castle.”

”Dancing With the Stars” (4.4 rating/12 share in adults 18-49, 20.9 million viewers overall) was the dominant show of the evening, according to preliminary nationals from Nielsen, peaking in the 9 o’clock half-hour that CBS has ruled in recent years with ”Two and a Half Men.” ABC also prevailed at 10 p.m. with ”Castle” (2.9/7 in 18-49, 12.2 million viewers overall).

At CBS, meanwhile, ”How I Met Your Mother” remains competitive at 8 o’clock (2.7/8 in 18-49, 6.7 million viewers overall), but the rest of the net’s comedy block is sagging: ”Mad Love” (2.2/6 in 18-49, 5.8 million viewers overall) was 6 shares out of the 18-49 lead at 8:30, as was ”Two and a Half Men” at 9 (2.2/6 in 18-49, 7.6 million viewers overall). These lower numbers made life more difficult for the two rookie shows that followed, as both ”Mike and Molly” (2.3/6 in 18-49, 8.1 million viewers overall) and ”Hawaii Five-0” (2.4/6 in 18-49, 9.4 million viewers overall) appeared to have hit first-run, same-night lows.

Fox was on the low side as well with ”House” (2.9/8 in 18-49, 8.5 million viewers overall) and ”The Chicago Code” (1.6/4 in 18-49, 5.5 million viewers overall), though the former placed second in 18-49 during the 8 o’clock hour. ”Code,” meanwhile, did nothing to improve its chances of returning for a second season.

NBC was on par with recent outings for ”Chuck” (1.4/4 in 18-49, 4.1 million viewers overall) and ”The Event” (1.3/3 in 18-49, 4.0 million viewers overall), while ”Law and Order: L.A.” (1.4/4 in 18-49, 4.8 million viewers overall) edged up for a second straight week but still ranked a distant third among the Big Three at 10 o’clock.

At CW, ”90210” (0.7/2 in 18-49, 1.5 million viewers overall) and ”Gossip Girl” (0.7/2 in 18-49, 1.3 million viewers overall) were down a bit week to week, with both shows earning a 0.9/3 in adults 18-34.

Perhaps contributing to lower ratings at most of the broadcast networks were a pair of second-round NBA Playoff contests on TNT, which featured big-market teams from Atlanta, Chicago, Dallas and Los Angeles.

Preliminary 18-49 averages for the night: ABC, 3.9/10; CBS, 2.4/6; Fox, 2.2/6; Univision, 1.5/4; NBC, 1.4/4; CW, 0.7/2.

In total viewers: ABC, 18.0 million; CBS, 7.8 million; Fox, 6.4 million; NBC, 4.3 million; Univision, 3.6 million; CW, 1.4 million.