Let's just take the player's word for it

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Wellemeyer loses about 5 mph on fastball
is the headline to article penned by Joe Strauss in today’s St. Louis
Post-Dispatch. The headline is culled entirely from the following quote
by Wellemeyer:

“Last year I was throwing 94-96 (mph), this year I’m topping out at
90-91,” he said. “I don’t know what it is but there’s definitely a
difference. It makes things more of a challenge, that’s for sure.”

With maybe five minutes of extra work, Strauss could have done
something to back or contradict Wellemeyer’s claim, but there’s
nothing. He does, at least, go to pitching coach Dave Duncan for an
additional comment, but whatever he got there wasn’t quote-worthy.

According to the article:

Pitching coach Dave Duncan suggests Wellemeyer is trying to be too
precise with his pitches, an observation Wellemeyer doesn’t dispute.
But Wellemeyer says the reason is his diminished velocity, which makes
his mistake pitches more vulnerable.

So, let’s go to the numbers. According to Baseball Info Solutions numbers presented at Fangraphs.com, Wellemeyer’s average fastball has slipped a bit, dropping from 92.3 mph to 91.5. PitchFx data had him at 92.2 in 2007, 92.7 last year and 91.4 this season.

Obviously, that’s not five mph. Five mph is huge. If his fastball was
down that much, he would have been demoted to the bullpen or place on
the disabled list a month ago.

Instead, Wellemeyer’s fastball is down about one mph, though not entirely consistently. As this chart shows, he’s been hanging around in the 92.0-92.5 range at times and dropping off to 90.5-91.0 in the others.

The drop likely is a problem. However, the bigger issue is that he’s
thinking about that drop. Duncan would surely prefer that he forget
about the radar gun readings and just go out and pitch. If Wellemeyer
can’t do that, he likely will find himself bounced from the rotation
soon.

Jon Niese leaves start with knee pain

PHOENIX, AZ - AUGUST 17:  Jonathon Niese #49 of the New York Mets delivers a pitch during the first inning against the Arizona Diamondbacks at Chase Field on August 17, 2016 in Phoenix, Arizona.  (Photo by Jennifer Stewart/Getty Images)
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Mets starter Jon Niese left his start Tuesday night against the Cardinals due to left knee pain.

Niese walked two and gave up an RBI single before leaving with a trainer with one out in the bottom of the first inning. He was eventually charged with three earned runs. Robert Gsellman, just up from Las Vegas, took over, making his major league debut under unexpected circumstances.

Niese, who has not pitched well at all since coming over in a trade with the Pirates, is likely to be placed on the disabled list after the game or before tomorrow’s game.

Mark Trumbo’s home run streak ends

OAKLAND, CA - AUGUST 11:  Mark Trumbo #45 of the Baltimore Orioles hits an RBI single against the Oakland Athletics during the fourth inning at the Oakland Coliseum on August 11, 2016 in Oakland, California. The Baltimore Orioles defeated the Oakland Athletics 9-6. (Photo by Jason O. Watson/Getty Images)
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Mark Trumbo still has many chances to hit a home run tonight — it’s only been an inning or so in the Nats-Orioles game — but his weird home run streak is over.

Coming into tonight’s game, Trumbo’s last seven hits had been homers. The all-time record had been 11, set by Mark McGwire back in 2001. The last time Trumbo got a hit that wasn’t a dong was back on August 11. Later in that game, however, he hit a grand slam. After that he went 6 for his next 34, with all those safeties dingers.

But that’s over now. In the first inning tonight he drove in a run with a two-out single. Then he was thrown out trying to stretch it to two. Good job on the RBIs, Mark. Bad job on the base running. Judgment withheld on the homer streak because, really, that’s just kind of weird and cool.