TECH-NET Auto Service 300
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| Venue | Charlotte Motor Speedway |
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| Location | Concord, North Carolina, United States |
| Corporate sponsor | Hisense |
| First race | 1978 |
| First NXS race | 1982 |
| Distance | 300 miles (480 km) |
| Laps | 200 (Stage 1: 45 Stage 2: 45 Stage 3: 110) |
| Previous names |
Sportsman 100 (1978) Sun Drop 300 (1979) Mello Yello 300 (1980–1984) Winn-Dixie 300 (1985–1988) Champion Spark Plug 300 (1989–1994) Red Dog 300 (1995–1996) Carquest Auto Parts 300 (1997–2009) Tech-Net Professional Auto Service 300 presented by CarQuest (2010) Top Gear 300 (2011) History 300 (2012–2014) Hisense 300 (2015) |
| Most wins (driver) | Kyle Busch (5) |
| Most wins (team) | Roush Fenway Racing (6) |
| Most wins (manufacturer) |
Chevrolet Ford (10) |
| Surface | Asphalt |
| Length | 1.5 mi (2.4 km) |
| Turns | 4 |
The Hisense 4K TV 300 is an annual 300-mile (482.803 km) NASCAR Xfinity Series race held at the Charlotte Motor Speedway in Concord, North Carolina during Memorial Day weekend as a support race for the Coca-Cola 600.
The race's origins trace back to 1978, when a NASCAR race was held the day before the World 600 as a Late Model Sportsman Series race, and in 1982 it became a Busch Series race.
From 2005 to 2009 the race was a Saturday night race. For 2010, the starting time was moved to 2:30 p.m. EST in response to fans wanting an afternoon NNS race and allowing for ABC coverage, allowing it to be part of a television doubleheader weekend for ESPN, paired with the Indianapolis 500 the next day. In 2015, the race's broadcast was transferred to Fox NASCAR after the departure of the NASCAR on ESPN content, allowing both of the races in Charlotte (the Hisense 300 on Saturday, and the Coca-Cola 600 on Sunday) to air on Fox.
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