NASCAR fans love a good upset.

They love to see drivers win their first race. They love to see underdog teams produce a Cinderella story with a shocking victory. And they love to see struggling stars rise from the ashes, bouncing back from injury or shaking off a long drought to return to victory lane.

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And nothing is more special than watching a rookie do the unthinkable, winning a race when no one gave him a chance. That's what Chris Buescher did on Monday, producing one of the biggest upsets in NASCAR history at Pocono Raceway. It doesn't matter that Buescher won under unusual circumstances, just as it didn't matter when young rookie Joey Logano won a rain-shortened race as a rookie in 2009 or when Aric Almirola won the rain-hampered race at Daytona in 2014.

A win is a win.

But that doesn't mean it's all good. This one was good for Buescher and good for his Front Row Motorsports team. But it's not necessarily good for the sport.

Or maybe it's NASCAR's rules that aren't good for the sport.

Buescher, who scuffled all season and drives for a struggling, underfunded team, is now in position to make the Chase. On the heels of a single, upset victory, he has a great chance to be one of 16 drivers competing for NASCAR's Sprint Cup championship, and that just doesn't seem right.

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While Buescher might have earned a spot in the Chase by meeting a requirement — he still must crack the top 30 in points — it exposes a great flaw in NASCAR's Chase format. A flaw many feared when the rules were tweaked three years ago.

What happens when a driver outside the top 30 produces a huge upset — a fluke win, if you will — and makes the Chase? That was the concern when these new Chase rules were unveiled.

And now we might find out.

This is in no way meant to disparage Buescher, the 2015 Xfinity Series champion and a talented young driver who could be a star one day. He's a development driver for Roush Fenway Racing and likely will land one of that team's rides at some point, giving him a chance to win again and possibly contend on a consistent basis. If Roush ever returns to form, Buescher might become a driver we talk about week to week.

Chris Buescher (Getty Images)

But right now, he's driving for Front Row Motorsports, a team that doesn't have the sponsorship and resources to be competitive. Front Row scored two upset victories in the past three years — David Ragan won at Talladega in 2013 — but it is not a top-25 team. It's barely a top-30 team.

Before Monday's fog-induced win, Buescher's best finish was 14th the previous week at Indy. Before that, he finished outside the top 25 in 14 of 19 races. He finished on the lead lap just three times. He was 33rd or worse in points until the past two weeks, when he climbed to 31st. His team is 32nd in owner points among the 39 full-time teams that have run every race, trailing even teammate Landon Cassill's team.

That doesn't sound like a Chase-caliber team. It sounds like a team that got lucky and beat the system.

Is that what NASCAR wants in the Chase?

If Buescher cracks the top 30 — he will drive at Watkins Glen six points back — and makes the Chase, it will knock a more deserving driver out of the playoffs.

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Right now, that driver would be Kyle Larson, who sits 15th in points and has come on strong of late to put himself into Chase contention. Or it could be Kasey Kahne, Trevor Bayne, Ryan Blaney or Ricky Stenhouse Jr., who are all racing hard for the final spot.

It could be Austin Dillon, Ryan Newman, Chase Elliott or Jamie McMurray, who have not won but are each in position to make the Chase on points.

Or, heaven forbid, it could be Dale Earnhardt Jr., who will miss at least five races but could race his way back to the brink of the Chase when he returns, only to get bumped by Buescher.

If any of those scenarios occur, it will be a black eye on the Chase and bring criticism from fans and competitors alike. That's a narrative NASCAR doesn't want during its playoff season. It faced enough controversy in 2014 when Ryan Newman made the championship race without a win and just four top-five finishes.

The simplest solution would be to tweak the Chase rules to require a driver to be in the top 20 or top 25 to become eligible for the Chase (except for drivers granted a medical waiver). That, of course, wouldn't prevent a driver from becoming eligible with an improbable win, but it would at least make them a bit more Chase-worthy.

Buescher's win was a beautiful thing. It was exciting, inspiring and fun to watch. But that doesn't mean he belongs in the Chase.