2023 FireKeepers Casino 400

The 2023 FireKeepers Casino 400 was a NASCAR Cup Series race held on August 6 and 7, 2023, at Michigan International Speedway in Brooklyn, Michigan. Contested over 200 laps on the two-mile (3.2 km) D-shaped oval, it was the 23rd race of the 2023 NASCAR Cup Series season. The race began on Sunday, August 6, before rain delayed it to Monday, August 7, after 74 laps were complete.

Michigan International Speedway, the track where the race was held.

The race was held at Michigan International Speedway, a two-mile (3.2 km) moderate-banked D-shaped speedway located in Brooklyn, Michigan. The track is used primarily for NASCAR events. It is known as a "sister track" to Texas World Speedway as MIS's oval design was a direct basis of TWS, with moderate modifications to the banking in the corners, and was used as the basis of Auto Club Speedway. The track is owned by International Speedway Corporation. Michigan International Speedway is recognized as one of motorsports' premier facilities because of its wide racing surface and high banking (by open-wheel standards; the 18-degree banking is modest by stock car standards).

• (R) denotes rookie driver.
• (i) denotes the driver ineligible for series driver points.

Martin Truex Jr. was the fastest in the practice session with a time of 37.496 seconds and a speed of 192.020 mph (309.026 km/h).

Christopher Bell scored the pole for the race with a time of 37.232 and a speed of 193.382 mph (311.218 km/h).

Martin Truex Jr. swept the stages, but Chris Buescher, driving for RFK Racing, would overtake him in the closing laps to win the race, marking the first time since 2010 where a Roush driver won consecutive Cup series races. Rounding out the top five would be Truex's JGR teammate Denny Hamlin, RFK's Brad Keselowski, and Kyle Larson of Hendrick Motorsports.

Stage One Laps: 45

Stage Two Laps: 75

Stage Three Laps: 80

• Lead changes: 26 among 16 different drivers
• Cautions/Laps: 9 for 43 laps
• Red flags: 1 for 19 hours, 5 minutes, and 18 seconds
• Time of race: 3 hours, 2 minutes, and 59 seconds
• Average speed: 131.159 miles per hour (211.080 km/h)

USA covered the race on the television side. Rick Allen, Jeff Burton, Steve Letarte and Dale Earnhardt Jr. called the race from the broadcast booth. Kim Coon, Parker Kligerman and Marty Snider handled the pit road duties from pit lane on Sunday. Kim Coon and Marty Snider handled the pit road duties on Monday.

Radio coverage of the race was broadcast by Motor Racing Network (MRN) and simulcast on Sirius XM NASCAR Radio. Alex Hayden and Jeff Striegle called the race in the booth while the field was racing on the front stretch. Dave Moody called the race from a billboard outside of turn 2 when the field is racing through turns 1 and 2. Mike Bagley called the race from a platform outside of turn 3 when the field races through turns 3 and 4. Steve Post, Chris Wilner and Jason Toy worked pit road for the radio side.