Diamondbacks announcer Bob Brenly mocks Marcus Stroman’s du-rag during broadcast

(CORRECTIONS AND CLARIFICATIONS: A previous version of this story misidentified the Arizona Diamondbacks' home TV network. It is Bally Sports Arizona.)

Arizona Diamondbacks announcer Bob Brenly mocked the du-rag of New York Mets pitcher Marcus Stroman during Tuesday night's game, a comment that drew attention from Stroman for what he called "racist undertones."

During the second inning, Bally Sports Arizona play-by-play partner Steve Berthiaume was talking about the split changeup from Stroman when the pitcher was getting ready to deliver a pitch. As the camera focused on Stroman, Brenly said, "Pretty sure that’s the same du-rag that Tom Seaver used to wear when he pitched for the Mets."

"Got the 41 patch on the sleeve right there,” Berthiaume replied. 

After the 6-5 loss to the Diamondbacks, Stroman took to Twitter to retweet several posts and comment on the incident.

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He wrote: "Onward and upward…through all adversity and racist undertones. The climb continues through all!”

A Diamondbacks spokesperson said the club was investigating the incident: "We were made aware, are reviewing it and will have internal conversations about the situation before commenting further."

One of Stroman's retweets read: "This is racist and it is unacceptable. Stroman deserves an apology. A league and its teams, forever pledging commitment to increased inclusivity, need to demand better."

He also quote-tweeted a post with, "Since I can’t say it because media will turn this against me somehow." The post said: "I am not surprised by this type of language towards African-American athletes. It’s the blatant racism and it’s been going on for a long time.

Stroman later posted pictures of himself with the message: “Du-rags coming soon. ”