NBC's Jimmy Fallon remains unchallenged, but the race for No. 2 is getting more interesting.

Not unlike the back-and-forth seen with his predecessor, Stephen Colbert is finding some particularly heated ratings competition with Jimmy Kimmel.

The race for No. 2 status behind late-night king Jimmy Fallon has been tipping ever-so-slightly in Kimmel's favor for nearly a month now, with ABC's Jimmy Kimmel Live! nabbing its third week on top of (or tying) Colbert's Late Show in the key demo.

For the week of Nov. 16-20, Kimmel averaged a .58 among adults 18-49. That put him just a hair above Colbert's .56 rating. Tonight led both shows handily, with a 1.0 rating in the key demo. It also stood as Fallon's biggest margin of victory to date over Colbert, a whopping 79 percent.

And, speaking of close margins, Seth Meyers' continues to enjoy a very strong season of Late Night. At 12:35 a.m., with the enviable Fallon lead-in, he took a .54 rating in the key demo.

No. 2 status for total viewers still belongs to Colbert. He beat Kimmel by more than 200,000 viewers for an average 2.62 million for the ninth week of the season. (Fallon boasted 3.32 million viewers.)

These are all small wins for Kimmel, to be sure, but they're still pretty significant considering how fresh Colbert's Late Show still is. And season-to-date, there would have to be a lot more movement for Kimmel to shrink the gap between No. 3 and No. 2 that the show currently has. Colbert is still outpacing Kimmel by 30 percent.