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NBC's experts also weigh in on the season's biggest surprise, the driver who has impressed them the most and storylines they'll be watching.
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NASCAR Xfinity Series Highlights: Kyle Busch charges back to the lead following a speeding penalty to win at Bristol, his second victory of the week.
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Fans have lamented the Formula One's hybrid power units since they were introduced to the sport in 2014, and many have hoped the series' post-2020 engine regulations will do away with them. But that unsurprisingly won't be the case.
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Race fans collectively drooled when IndyCar unveiled how dramatically different its cars will look in 2018, but the new body kits don't only represent a massive step forward in terms of aesthetics.
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Kyle Larson used a dramatic overtime restart to score his third win Cup of the season.
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Team Penske driver won this race in 2015 and '16 after qualifying first.
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As a kid, Truex dreamed of winning at Watkins Glen. Today, that dream became reality.
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Dale Earnhardt Jr: 'I will devote my heart and soul to this broadcast team and pledge my very best to the millions who watch it.'