There was a palpable buzz inside Citi Field on Wednesday night as the Mets faced the Phillies.
Yes, it was due in part to the fact that New York was going for (and eventually securing) a three-game sweep over their division rival in what has all of a sudden become a tight race for the NL East title.
But what made it feel truly different on Wednesday -- the reason every fan was on the edge of their seat and perhaps timing their bathroom, food, and beer runs differently -- was the pitcher on the mound in orange and blue.
Nolan McLean, who tossed 5.1 shutout innings in his big league debut on Aug. 16 at Citi Field and followed that up with seven innings of one-run ball against the Braves on Aug. 22 in Atlanta, took it up several rungs during a masterful performance that left the Phillies flailing.
While firing eight shutout innings, McLean allowed just four hits, walked none, and struck out six.
He had everything working so well and Philadelphia so off-balance that he was at only 59 pitches with one out in the seventh inning -- truly outrageous.
McLean's ball-to-strike ratio was elite, with 71 of the 95 pitches he threw going for strikes.
The stuff, of course, was what allowed him to lay the hammer down so emphatically.
But there was also the mound presence (which has been evident since his first start), the confidence he displayed while deploying his arsenal (he said after the game that he's totally comfortable being more in the zone with New York's defense behind him), and the unflappability that seems to envelop him.
As McLean toyed with the Phillies, whose batters twice had the bat fly out of their hands, he relied heavily on his dastardly sweeper, a four-seam fastball, a sinker that had a ridiculous amount of movement and topped out at 96.4 mph, and a curve that dropped off the table. He also mixed in his changeup and cutter for good measure.
He generated 13 swings and misses and got 24 called strikes, and only came close to walking a batter once.
When McLean found trouble for the first time with runners on first and third and no one out in the eighth, he wiggled out of it, generating two short fly outs and a dribbler in front of the plate.
It was the kind of performance that makes you dream about what this Mets team can do, and obviously leaves you wondering just how good McLean can be.
Through three starts, McLean's numbers are eye-popping.
In 20.1 innings, he has posted a 0.89 ERA and 0.69 WHIP while allowing just 10 hits, walking four, and striking out 21.
And on Wednesday, McLean became the first MLB pitcher since Randy Johnson in 1988 to have a 3-0 record with 20+ innings pitched, 20+ strikeouts, and a sub-.200 opponents batting average through his first three career starts.
While McLean's dazzling display on Wednesday should make people look forward, his outing -- and how he's looked overall since arriving in the bigs -- should also leave you glancing back at two former Mets pitching stars who had similar qualities: Matt Harvey and Jacob deGrom.
To be clear: McLean is not Harvey or deGrom. He will forge his own path and career.
But the way he's arrived as a dominant force seemingly close to a finished product is reminiscent of how Harvey looked in 2012 when he first took the ball in Arizona and how deGrom looked in 2014 when he made his first start against the Yankees at Citi Field.
Like Harvey and deGrom, McLean has taken it up a notch since arriving in the majors.
And like Harvey, it could be McLean who helps usher in a new era of homegrown starting pitching.
Jonah Tong, who put up video game numbers this season in the minors, will make his first big league start on Friday against the Marlins at Citi Field.
Then there's Brandon Sproat, who could be on track to join the Mets shortly after the rosters expand on Sept. 1.
But for now, the focus is rightfully on McLean, who has helped give the Mets the spark they desperately needed while taking the league by storm.