Boston Red Sox pitcher David Price thinks Major League Baseball made a mistake by having just 10 games Monday on Jackie Robinson Day.

“Hey @mlb every year on April 15th we celebrate Jackie Robinson Day,” Price tweeted Wednesday. “EVERYONE plays on that day next year deal? No one should have an off day let alone 10 teams!!”

African American players dropped from 18 percent of the majors leagues in 1991 to 7.7 percent in 2017, then rose to 8.4 percent in 2018, according to The Institute for Diversity and Ethics in Sport at Central Florida. Price, who won the 2012 AL Cy Young Award, thinks more efforts on Jackie Robinson Day are needed.

Baltimore Orioles' Miguel Castro, center, and Jesus Sucre, left, celebrate with teammates after defeating the Boston Red Sox during a baseball game in Boston, Monday, April 15, 2019. (42) in honor of Jackie Robinson Day.(AP Photo/Michael Dwyer)
Baltimore Orioles’ Miguel Castro, center, and Jesus Sucre, left, celebrate with teammates after defeating the Boston Red Sox during a baseball game in Boston, Monday, April 15, 2019. (42) in honor of Jackie Robinson Day.(AP Photo/Michael Dwyer)

Jackie Robinson broke the major league color barrier for the Brooklyn Dodgers on April 15, 1947.

“1/3 of @mlb teams had an off day on Jackie Robinson day,” tweeted Price, who is black. “I just can’t wrap my head around that. We’ve had a problem for a while and this couldn’t make it any more noticeable.”

This year, April 15 fell on a Monday. Most teams’ scheduled off days are on Mondays and Thursdays.

Texas Rangers' Delino DeShields wears shoes with Jackie Robinson's image prior to playing the Los Angels Angels in a baseball game Monday, April 15, 2019, in Arlington, Texas. (AP Photo/Michael Ainsworth)
Texas Rangers’ Delino DeShields wears shoes with Jackie Robinson’s image prior to playing the Los Angels Angels in a baseball game Monday, April 15, 2019, in Arlington, Texas. (AP Photo/Michael Ainsworth)

“In a perfect world, all teams would play on Jackie Robinson Day,” Major League Baseball said in a statement. “Unfortunately, there are some scheduling challenges when April 15th falls on a Monday, which is a heavy travel day for clubs. MLB worked with the clubs who were not playing on Monday to ensure that their players would wear 42 and have festivities on Tuesday to celebrate Jackie Robinson Day. While it is not ideal, one benefit is that this extends the celebration and awareness of Jackie Robinson Day over two days and guarantees that every one of our players participates.”

Red Sox manager Alex Cora agreed with his player.

“It makes sense to play that day,” Cora said. “In my opinion, yes, he’s right about that.”

Seattle Mariners starting pitcher Yusei Kikuchi wears No. 42 in honor of Jackie Robinson Day as he warms up in the bullpen before a baseball game against the Cleveland Indians, Monday, April 15, 2019, in Seattle. (AP Photo/Ted S. Warren)
Seattle Mariners starting pitcher Yusei Kikuchi wears No. 42 in honor of Jackie Robinson Day as he warms up in the bullpen before a baseball game against the Cleveland Indians, Monday, April 15, 2019, in Seattle. (AP Photo/Ted S. Warren)

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Bases bearing Jackie Robinson's name wait to be installed on Jackie Robinson Day prior to a baseball game between the Los Angeles Dodgers and the Cincinnati Reds, Monday, April 15, 2019, in Los Angeles. (AP Photo/Mark J. Terrill)
Bases bearing Jackie Robinson’s name wait to be installed on Jackie Robinson Day prior to a baseball game between the Los Angeles Dodgers and the Cincinnati Reds, Monday, April 15, 2019, in Los Angeles. (AP Photo/Mark J. Terrill)