Mets pitching prospect Jonah Tong to make MLB debut vs. Marlins

NEW YORK — The Mets are calling up top-tier pitching prospect Jonah Tong, manager Carlos Mendoza announced Tuesday, as the club continues to bolster its staff with young talent for the stretch run.

Mendoza said Tong will start against the Miami Marlins on Friday in his major league debut.

Tong pitched himself into the big league picture with arguably the best season for a pitcher in the minor leagues, going 10-5 with a 1.43 ERA in 113 ⅔ innings across 22 starts between Double-A and Triple-A this season. The 22-year-old right-hander was recently promoted to Triple-A Syracuse, where he tossed 11 ⅔ scoreless innings over two outings.

“I think it’s all about dominating the minors,” Mendoza said. “It’s hard to keep him there.”

The consistent dominance, in combination with debilitating underperformance from veterans in the Mets’ starting rotation, prompted president of baseball operations David Stearns, who preaches patience in player development, to make the call.

Tong was the No. 21 prospect in baseball in the latest rankings by ESPN’s Kiley McDaniel. The Canadian will join Nolan McLean, the team’s No. 2 prospect who soared through the upper minors and was called up to boost the Mets’ struggling rotation earlier this month.

“This is fast,” Stearns said. “There’s no question this is fast. He’s pushed us on this because of his performance. We think he’s ready for this. We also acknowledge that this has gone faster than any of us would have anticipated at the start of this year.”

The decision to summon Tong came one day after veteran right-hander Kodai Senga continued his recent struggles, logging just four innings against the Philadelphia Phillies on four days’ rest.

Editor’s Picks

2 Related

Senga has a 5.40 ERA and has not completed six innings in eight starts since coming off the injured list last month. Mendoza indicated the team prefers to give Senga an extra day of rest moving forward.

“I’m going to be honest: Performance matters,” Mendoza said about Senga. “We’re to a point now where we got to see performance. And that was a conversation with him. We need him because he’s an ace. We’ve seen it in the past, but we haven’t been able to get that consistency. So, yeah, maybe it’s the regular rest, the extra day, whatever that is. We’re getting to a point where like every game, we got to put our best guys out there.”

Entering Tuesday, the Mets are 2 ½ games ahead of the Cincinnati Reds for the final National League wild card spot.

The baby-faced Tong, a seventh-round pick out of high school in 2022, made a significant leap forward in his development in 2024, but he reported to spring training this year seemingly on a path for a 2026 major league debut — as evidenced by the Mets’ decision not to invite him to big league camp.

Mendoza said he met Tong while watching a minor league game on a back field in which Tong was the ball boy.

“When you’re in the minor leagues, you got to go through those duties,” Mendoza said. “And that day, he happened to be on the Triple-A bench, and he was the ball boy and I sat right next to him, and I had a brief conversation. Kind of introduced myself [to] kind of get to know him.

“Genuine, humble and you could just see the youth on his face. It was, I don’t know, 10 minutes that we sat there and watched the game while I was trying to get to know him a little bit.”

Tong, who represented the Mets at the Futures Game last month, leads all 196 qualified minor league pitchers in ERA, FIP (1.66), batting average against (.148) and strikeout rate (40.5%) this season. His 0.92 WHIP ranks second. He has compiled 179 strikeouts and allowed just two home runs.

He boasts a fastball in the mid-90s that touches 97 mph and has produced a whiff rate of 36.5% this season. This year, he added a changeup in the mid-80s that has emerged as his second-most used offering and improved his effectiveness against left-handed hitters. A curveball and slider complete his repertoire.

Slight for a pitcher — he’s listed at 6-foot-1, 180 pounds — with a smooth and deceptive over-the-top delivery, Tong has drawn comparisons to former Cy Young Award winner Tim Lincecum.

“What’s impressed us the most is the speed with which he’s expanded his arsenal in really effective ways,” Stearns said. “So, he’s added a changeup this year that’s been really good. And we’ve seen outings that have shown, I think, tremendous maturity on the mound — where something’s not working, he’s then able to switch an approach and go to the slider more, throw a few more curveballs, and allow himself to get through outings really successfully, even if he’s not following the exact plan that he thought he was going to follow when he went into the game.”

The Mets chose promoting Tong over Brandon Sproat, another highly regarded pitching prospect in Triple-A. Stearns explained the organization’s decision as a product of Tong’s excellence and the timing of the start, which will keep Tong, who last pitched on Saturday, on turn.

Sproat, 24, gave up seven runs across 3 ⅔ innings out of the bullpen for Syracuse on Saturday after recording a 2.05 ERA over his previous nine outings, all starts.

“Brandon’s done a tremendous job, and he’s probably had as good a second half of season as any pitcher in minor league baseball,” Stearns said. “He’s made some real adjustments. He’s pitched great.”

The Mets’ plan for Tong after Friday is unclear. While McLean has cemented himself in the club’s starting rotation after allowing just two runs over 12 ⅓ innings in his first two starts, Tong will join the Mets as their sixth starter.

Mendoza said he didn’t know if Tong would move to the bullpen following Friday’s start.

“We’re going turn by turn at this point,” Stearns said. “And it’s going to be a combination of what the matchups are, who we think match up well, how our guys are throwing, who needs rest, who doesn’t need rest. I think in September, we try not to plan too far ahead and we’re going to go turn by turn.”