MLB threatens pitchers with 10-game bans for using foreign substances on balls

Pitchers will be ejected and suspended for 10 games for using illegal foreign substances to doctor baseballs in a crackdown by Major League Baseball that will start June 21. The commissioner's office, responding to record strikeouts and a league batting average at a more than half-century low, said Tuesday that major and minor league umpires will start regular checks of all pitchers, even if opposing managers don't request inspections.

Repeat offenders will receive progressive discipline, and teams and club employees will be subject to discipline for failure to comply.

"After an extensive process of repeated warnings without effect, gathering information from current and former players and others across the sport, two months of comprehensive data collection, listening to our fans and thoughtful deliberation, I have determined that new enforcement of foreign substances is needed to level the playing field," baseball Commissioner Rob Manfred said in a statement.

"I understand there's a history of foreign substances being used on the ball, but what we are seeing today is objectively far different, with much tackier substances being used more frequently than ever before. It has become clear that the use of foreign substance has generally morphed from trying to get a better grip on the ball into something else — an unfair competitive advantage that is creating a lack of action and an uneven playing field."

MLB told teams on March 23 it would increase monitoring and initiated steps that included collecting balls taken out of play from every team and analyzing Statcast spin-rate data.

CBSSports.com described one grip enhancer called Spider Tack as "a kind of industrial glue that sends spin rates skyrocketing."

"Based on the information collected over the first two months of the season — including numerous complaints from position players, pitchers, umpires, coaches and executives — there is a prevalence of foreign substance use by pitchers in Major League Baseball and throughout the minor leagues," MLB said.

"Many baseballs collected have had dark, amber-colored markings that are sticky to the touch. MLB recently completed extensive testing, including testing by third-party researchers, to determine whether the use of foreign substances has a material impact on performance. That research concluded that foreign substances significantly increase the spin rate and movement of the baseball, providing pitchers who use these substances with an unfair competitive advantage over hitters and pitchers who do not use foreign substances, and results in less action on the field.

"In addition, the foreign substance use appears to contribute to a style of pitching in which pitchers sacrifice location in favor of spin and velocity, particularly with respect to elevated fastballs. The evidence does not suggest a correlation between improved hitter safety and the use of foreign substances."

The anticipated clampdown already appears to have had an impact.

Fastball spin rates averaged 2,306-2,329 revolutions per minute each week from the start of the season though June 5, according to MLB Statcast data.

Following an owners' meeting on June 3 when talk of a crackdown emerged, the average declined to 2,282 during the week of June 6 and dropped to 2,226 on Sunday.

The major league batting average was .232 through April, down from .252 two years ago and under the record low of .237 set in 1968, and it was .236 through May, its lowest since 1968.

The average rose to .247 in the week of June 6, lifting the season average to .238.

The strikeout percentage since June 3 is 23.4%, down from 24.2% until then, and the walk percentage is 8.4%, down from 8.9%.

"This is not about any individual player or club, or placing blame," Manfred said. "It is about a collective shift that has changed the game and needs to be addressed. We have a responsibility to our fans and the generational talent competing on the field to eliminate these substances and improve the game."

While Bill Miller, president of the Major League Umpires Association, was quoted as being supportive in the announcement, there was no similar statement from the Major League Baseball Players Association. The players' union said it was reviewing the memo and did not have immediate comment.

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