Drake diss single by Kendrick Lamar opens at #1 in the US.  

Lamar's fourth No. 1 song after Future and Metro Boomin's Like That, 2017's Humble, and Taylor Swift's Bad Blood is the blistering track, which calls the Canadian hitmaker a “certified pedophile”.  

Euphoria, another tune in his rapid-fire, increasingly vitriolic rap war with Drake, debuted at 11 last week and reached number three.  

Drake's Family Matters, one of several replies to the rivalry in the past two weeks, is seventh on the singles list.

Lamar's chart success is the latest in the headline-grabbing feud, which has escalated over the last month into a full-scale lyrical war involving Rick Ross and The Weeknd.  

Lamar's Like That verse in late March sparked a series of diss tracks, including Euphoria, 6:16 in LA, Meet the Grahams, and Not Like Us, and Drake's Push Ups, Taylor Made Freestyle, Family Matter, and The Heart Part 6.  

In the last two weeks, both artists attacked the other's lifestyle and family  

Lamar claimed that Drake engaged in young people and hid a child, escalating public animosity.  

In Not Like Us, he raps, “Say Drake, I hear you like ’em young / You better not have to go to Cell Block One,” which has Drake's Toronto house doctored to read “registered child offender”.  

The Title Track Beat of “The Tortured Poets Department” by Taylor Swift Is Ideal for Cardiopulmonary Resuscitation