Adele Hello

Adele in the video for "Hello."

Courtesy of VEVO

Adele appears set for a second week at No. 1 on the Billboard Hot 100 with her single "Hello," following its record-smashing first week, while Ariana Grande and Justin Bieber should make splashy debuts with their new singles. Plus, Bieber looks headed for big second week with "Sorry," new at No. 2 on the Hot 100 this week.

Adele Says 'Hello' to No. 1 Hot 100 Debut & 1-Million-Plus Sales Record

Highlights of the next Hot 100, dated Nov. 21, will be revealed on Billboard.com on Monday, Nov. 9, with the entire chart posting the following day. (See the current, Nov. 14-dated Hot 100, in full, here.)

'HELLO,' No. 1, AGAIN: Industry forecasters suggest that "Hello" could sell 500,000 in the week ending Nov. 5. Released Oct. 23, it sold 1,112,000 in its first week (ending Oct. 29), shattering the mark for most downloads sold in a week, passing Flo Rida's "Right Round," which moved 636,000 (Feb. 28, 2009, according to Nielsen Music).

Adele's 'Hello' Has Biggest Sales Week for a Single Since Elton John's Princess Diana Tribute in 1997

On the Hot 100, sales of perhaps half a million for "Hello" will combine with continued hefty streaming (following its arrival with 61.6 million U.S. streams) and airplay data (73 million in audience, as reflected on the Nov. 14 Hot 100), setting the stage for a likely second week at the summit.

The piano ballad is the lead single from Adele's Nov. 20 album 25. Its start also propels Adele to the top of the Billboard Artist 100 this week.

GRANDE ENTRANCE: Industry forecasters are also looking at 110,000-120,000 downloads sold for Ariana Grande's "Focus" in its first week. Combined with projected streaming and airplay figures, the track appears set for a debut in the Hot 100's top 15 next week.

"Focus" is the lead single from Grande's third album, Moonlight, due next year.

THE BIEBER 'SHOW': Meanwhile, Justin Bieber could boast three songs in the Hot 100's top 40 next week. After "Sorry" entered the Nov. 14 Hot 100 at No. 2 with 277,000 downloads sold (and 23.1 million U.S. streams and 33 million in radio audience), industry forecasters peg the song to sell 140,000-150,000 in its second week. Such a sum, along with second-week streaming and airplay, should keep the song in the Hot 100's top five.

Justin Bieber Unveils 'Purpose' Track List on Twitter

Bieber is also looking at a top 40 Hot 100 debut for "I'll Show You," another song from his Nov. 13 album Purpose. The track could start with sales of around 120,000. On the Nov. 14 chart, lead Purpose single "What Do You Mean?" ranks at No. 5, after debuting at No. 1 Sept. 19, marking Bieber's first Hot 100 leader.

To find out if Adele officially tops the Hot 100 for a second week, and the latest chart action for Grande and Bieber, check Billboard.com Monday (Nov. 9).

Additional reporting by Keith Caulfield and Emily White