Don’t happy, be worry. Our sports either have too many rules or too few. That’s worrisome.

Saturday’s Kentucky Derby has 20 entrants. Too many.

Consider that humans driving cars at crawl-speed have trouble adhering to alternate merges at the Holland Tunnel. Why would 20 jockeys aboard 20 3-year-old thoroughbreds at high speeds — most eager to reach the rail — be systematically placed in maximum peril?

The favorite, undefeated Nyquist, drew the 13th post. That’s a lot of jockeying for position for a jockey to jockey for position. But not as much as will be needed by the seven starting from Nyquist’s outside.

Nyquist’s previous race, last month’s Florida Derby, was won from the fourth position in a 10-horse race. He left quickly for a good position he held. But a quick, clean break from the 13-hole on Saturday should still put him — and the rest — in thick, dangerous traffic.

The favorite in the Florida Derby, Mohaymen, on Saturday will start from the 14th post. In the Florida Derby, Mohaymen, from the nine-hole, was bumped in the first turn, unsuccessfully trying to get inside. He briefly challenged from the outside at the top of the stretch, then faded to a distant fourth.

So what’s the plan for Mohaymen on Saturday against 19 horses? Start wide, stay wide? He will have to bolt, then move toward the rail through hopeful openings.

Unless horses are better at alternate merges than people, 20 inexperienced horses — all expected to burst from the gate, then deal with a mob — are too many. Why shouldn’t I worry?

I’m also worried for what baseball’s doing to baseball, devouring itself from the inside out, turning the game desultory, pushing it to become a niche sport that relies on acquired tastes rather than inherited cradle-to-grave devotion.

At a time when MLB claims to be trying to speed up play, box scores daily tell us that 5-3 and 6-4 games run 3:20 and include 10 “by the book” pitchers.

Last Saturday’s 8-0 Red Sox win over the Yankees (an 8½-inning game) ran a soporific 3:30.

Sunday was loaded with unreasonably long nine-inning games; two ran 3:33.

Sunday night’s ESPN games regularly feature one or two large-TV-market Eastern Time Zone teams playing well after the Eastern Time Zone has zoned out. Last Sunday’s on-ESPN-orders Yankees-Red Sox game ended at 11:30.

Think folks here and in Boston will be awake for the finish to this Sunday night’s ESPN Red Sox at Yankees game?

The fierce Red Sox-Yankees rivalry will be played to thousands of empty seats as per the collision of two forms of greed — ESPN’s purchased authority to schedule 8:05 Sunday night games and Yankee Stadium’s far-too-expensive tickets.

Next, throw in growing replay-rules stoppages and considerations, most of them unintended. They’re not even close to the out-by-a-mile “We Need Replay!” outrage that in 2010 deprived the Tigers’ Armando Galarraga of a perfect game.

Sunday’s Mets-Giants game was stopped cold (and rainy) when the Giants challenged a close call that Hunter Pence was out at first.

On SNY, Gary Cohen and Ron Darling examined replays showing the live-look self-evident: It was a close call, so close that reversing it would have been a matter of concluding that inconclusive evidence was conclusive. (And that, as a matter of “getting it right,” often happens!)

But this call was upheld. And Cohen and Darling missed another opportunity — it seems all sportscasters do — to examine the larger issue: Was this the kind of call MLB or any other sport intended to have reviewed when it acceded to cries to add replay rules?

The answer is no. Yet these kinds of calls have become the overwhelming reason to unplug and further slow games. And with sports stuck in denial, we’re stuck with such folly.

Tuesday: With the Braves up, 3-0, two out in the top of the ninth, Atlanta’s Adonis Garcia grounded out on a close call.

But hold everything! “They’re going to hold things up,” Cohen said, “to see whether the Braves want to challenge the call at first base.”

That’s the bag into which MLB has dropped The Game and its fans. We must now wait just to discover whether a close call will be challenged! A delay to await word on whether there will be a longer delay!

And, again, Cohen and Darling, now joined by Keith Hernandez, missed the big picture: Was this the kind of call that created demand for replay challenges?

Of course, not; yet a sport that has become slow, then slower, is further slowed by something no one wanted or needed. And with the genie knee-jerked out of the toothpaste tube, that’s how it’s going to stay. You bet I worry.

More unneeded rules: I recently jabbed the NBA for adding “anti-flopping” rules and punishments, suggesting that players who choose to take themselves out of play by hitting the deck pretending to have been fouled should be ignored. Just play on.

To that, I received thoughtful emails suggesting that such rules are different — and needed — as floppers try to deceive referees as opposed to opponents.

But isn’t that what top-of-the-sport refs are trained and hired to do; to know the difference?

When I covered the NBA, ref Jake O’Donnell, suspecting M.L. Carr, then with the Celtics, was trying to bait him into calling an offensive foul, looked down at Carr’s pleading expression, smiled and shook his head no. Play continued.

At the next whistle, Carr patted O’Donnell on the tush while telling him, “Ya got me.”

If trying to deceive a game official is inexcusably different than trying to deceive a player, every catcher who tries to “steal” a strike by “framing” a pitch should be ejected.

Rutgers, already bleeding millions in student and taxpayer money in pursuit of becoming a “football school,” seems to go out of its way — literally and figuratively — to spend as much as possible on football.

Its non-conference road game this season will transport Rutgers’ student-athletes to Seattle to play Washington. Money is no object.

Rutgers football’s recent-past non-conference road games have included Fresno State, Washington State and Tulane. It’s crazy.

Say, whatever happened to all those FanDuel and DraftKings TV ads? And what happened to all those “It’s not gambling” sports commissioners, and all the team owners and TV networks who were so eager to invest millions for their cut of suckering mostly young-adult sports fans?

Not even one willing to concede they were blinded by ask-no-questions greed or that bad faith doesn’t always make good business?