All Times Eastern
TALES OF THE TURTLES 400
Site: Joliet, Illinois.
Schedule: Friday, practice, 12:30 p.m. (NBCSN), qualifying, 6:45 (NBCSN); Saturday, practice 11:30 a.m. (CNBC), practice, 2 p.m. (NBCSN); Sunday, race, NBCSN
Track: Chicagoland Speedway (oval, 1.5 miles).
Race distance: 400.5 miles, 267 laps
Last year: Martin Truex Jr. won in Chicago after starting sixth.
Last race: Kyle Larson picked up his second victory in four races in Richmond.
Fast facts: Truex heads into the playoffs as the favorite after a dominant regular season. Truex also won a pair of first-round races in 2016. ...Kyle Larson, who finished ninth a year ago, is second. ...Kyle Busch has been better at Chicagoland than any other playoff track, posting seven top 10s in 12 starts. ...Jimmie Johnson, the champion last season, has just three top-10 finishes since winning in Dover in June.
Next race: ISM Connect 300, Sept. 24, New Hampshire Motor Speedway, Loudon, New Hampshire.
Site: Joliet, Illinois.
Schedule: Friday, practice, 2 p.m. (NBCSN), practice, 4 p.m.; Saturday, qualifying, 12:35 p.m. (NBCSN), race, 3:30 p.m., NBCSN.
Track: Chicagoland Speedway
Race distance: 300 miles, 200 laps
Last year: Erik Jones held off Kyle Larson and Elliott Sadler to finish first.
Last race: Brad Keselowski won in Richmond.
Fast facts: This week's race will lock in the last three drivers for the playoffs. ..Elliott Sadler clinched the regular season title by finishing fifth last week. Sadler leads teammate William Byron by 95 points. ...Kurt Busch and Erik Jones each had a loose lug nut in post-race inspection after Richmond. Their crew chiefs were fined $10,000 each.
Next race: Visitmyrtlebeach.com 300, Sept. 23, Kentucky Speedway, Sparta, Kentucky.
CAMPING WORLD TRUCK
Site: Joliet, Illinois.
Schedule: Thursday, practice, 3:30 & 6:30 p.m.; Friday, qualifying, 5:05 p.m. (FS1), race, 8:30, FS1.
Track: Chicagoland Speedway.
Race distance: 225 miles, 150 laps.
Last year: Kyle Busch led 95 of 151 laps for the win.
Last race: Austin Cindric won in Canada from the pole for his first career victory.
Fast facts: The field for the playoffs will be set following Friday's race. Seven drivers have already clinched postseason spots, and one spot remains up for grabs. ... Christopher Bell leads the series with four victories and 24 playoff points, and he can add 15 more playoff points if he clinches the regular season title this weekend. ... John Hunter Nemechek is second after winning twice this season.
Next race: UNOH 175, Sept. 23, New Hampshire Motor Speedway.
GOPRO GRAND PRIX
Site: Sonoma, California.
Schedule: Friday, practice, 1 p.m., practice, 5 p.m. (NBCSN); Saturday, practice, 2 p.m., qualifying, 6:30 p.m. (NBCSN); Sunday, race, 6:50 p.m. (NBCSN).
Track: Sonoma Raceway (road, 2.385 miles)
Race distance: 202.7 miles, 85 laps
Last year: Simon Pagenaud won the Sonoma race, clinching the series title in emphatic fashion.
Last race: Alexander Rossi won his second career race at Watkins Glen.
Fast facts: The 2017 season comes to a close in Sonoma. Josef Newgarden, in search of his first series title, leads Scott Dixon by just three points - the smallest difference between the top two ahead of the final event since 2007. ... Newgarden has never finished in the top five at Sonoma, while Dixon won there in 2014 and 2015. ... Helio Castroneves (22 points back) and Simon Pagenaud (34 points back) are third and fourth.
SINGAPORE GRAND PRIX
Schedule: Friday, 4:30 & 8:30 a.m.; Saturday, practice, 6 a.m., qualifying, 9 a.m.; Sunday, race, 8 a.m., NBCSN.
Track: Marina Bay Street Circuit (circuit, 3.44 miles).
Race distance: 192.8 miles, 56 laps
Last year: Nico Rosberg won his third consecutive race, leading 59 of 61 laps.
Last race: Lewis Hamilton won in Italy, his third victory in four events.
Fast facts: Thanks to his recent hot streak, Hamilton now leads Sebastian Vettel of Ferrari by three points. Hamilton has 238 points while Vettel has 235. Valtteri Bottas is third with 197 points. ...Singapore hosted the first night race in Formula 1 history back in 2008.
Next race: Malaysia Grand Prix, Oct. 1, Sepang International Circuit, Kuala Lumpur.
Site: Concord, North Carolina
Schedule: Friday, qualifying, 3:30 & 6 p.m.; Saturday, qualifying, 1:30 & 4 p.m.; Sunday, finals, 5:17 p.m.
Track: zMax Dragway.
Last year: Antron Brown took first outside of Charlotte.
Last race: Steve Torrence won the U.S. Nationals in Indianapolis.
Fast facts: Torrence has seven victories and nine final-round appearances and is first in the point standings. He has a 20-point lead over Brown, the back-to-back world champion, after taking seven of the last 13 events. ... Leah Pritchett, Tony Schumacher and Doug Kalitta are 30, 40 and 50 points off the lead respectively.
Next race: Dodge NHRA Nationals, Sept. 21-24, Maple Grove Raceway, Mohnton, Pennsylvania.
WORLD OF OUTLAWS: Friday and Saturday, Wine Country Outlaw Showdown, Calistoga Speedway, Calistoga, California.