Univision remain’s America’s most popular Spanish-language network, but Telemundo may be making it sweat a little.

Already enjoying its best season ever, the NBCUniversal-owned Telemundo achieved a ratings milestone on Tuesday night when its regular lineup beat Univision head-to-head in adults 18-49 for the first time. According to “live plus same-day” Nielsen estimates, Telemundo averaged 969,000 adults 18-49 (0.76 rating) to edge out Univision’s 943,000 (0.74).

Telemundo had topped Univision with sports and special programming on four prior occasions, but this is the first time it did so with both networks airing regular entertainment lineups.

A key driver for Telemundo over the past year-plus has been its performance with original telenovelas in the 10 o’clock hour. Last night, “El Senor de los Cielos 3” (Lord of the Skies) not only beat Univision’s “Yo No Creo En Hombres” (I Don’t Trust Men Anymore) in 18-49 (1.4 rating vs. 0.7 rating) but also stood as No. 1 on all of television for the 10 p.m. hour. (The top English-language broadcast program was NBC’s “Hollywood Game Night,” with a 1.3 rating.)

For the 2014-15 television through Sunday, Univision was averaging 1.34 million adults 18-49 (down 8% from the previous season) to 720,000 for Telemundo (up 3%), according to “most current” Nielsen estimates. And the second quarter of this year marked the third straight quarter that the gap between the networks had closed in 18-49.