Starting pitcher Jake Arrieta

Cubs starting pitcher Jake Arrieta tips his cap while departing in the 7th inning of Game 4 of the NLCS at Wrigley Field on Oct. 18, 2017.

Jake Arrieta reacts after striking out the Dodgers’ Curtis Granderson to end the top of the 6th inning on Oct. 18, 2017 in Game 4 of the National League Championship Series.

Cubs starting pitcher Jake Arrieta walks out of the bullpen before Game 4 of the National League Division Series on Oct. 11, 2017.

Jake Arrieta talks to Theo Epstein as he works out on Oct. 7, 2017 before Game 2 of a National League Division Series playoff.

Jake Arrieta wears a football jersey as he leaves Wrigley with the team for their roadtrip on Sept. 3, 2017.

Jake Arrieta loses his bat as he strikes out during the 3rd inning against the Brewers on Sept. 21, 2017.

Jake Arrieta is congratulated by his teammates after finishing off the Pirates in the 5th inning at Wrigley Field on Aug. 29, 2017.

Jake Arrieta watches as a two-run home run by the Cardinals’ Tommy Pham leaves the park during the 2nd inning on Sept. 26, 2017.

Cubs starting pitcher Jake Arrieta pitches during the first inning against the Blue Jays on Friday, Aug. 18, 2017, at Wrigley Field.

Cubs pitcher Jake Arrieta, left, talks with pitching coach Chris Bosio, right, after throwing against the Diamondbacks during the sixth inning Sunday, Aug 13, 2017, in Phoenix.

Javier Baez is congratulated by Jake Arrieta after hitting a two-run, inside-the-park home run against the Giants during the second inning at AT&T Park on Aug. 7, 2017.

Cubs starting pitcher Jake Arrieta delivers a pitch against the White Sox during the second inning at Guaranteed Rate Field on Wednesday, July 26, 2017.

Cubs catcher Willson Contreras, left, and starting pitcher Jake Arrieta talk on the mound during a game against the Orioles in Baltimore on Saturday, July 15, 2017.

Cubs manager Joe Maddon meets briefly with Jake Arrieta after Maddon pulled the starting pitcher from the game in the sixth inning against the Pirates at Wrigley Field on Saturday, July 8, 2017.

Cubs starting pitcher Jake Arrieta walks back to the dugout after the fourth inning of a game against the Reds on Sunday, July 2, 2017, in Cincinnati.

Cubs pitcher Jake Arrieta smiles in the dugout after pitching seven innings against the Marlins at Marlins Park on June 22, 2017, in Miami.

Cubs pitcher Jake Arrieta walks towards the dugout after being removed from the game in the fifth inning against the Pirates at PNC Park on June 17, 2017, in Pittsburgh.

Cubs starting pitcher Jake Arrieta rounds third after hitting a two-run home run off Pirates starting pitcher Ivan Nova in the fifth inning in Pittsburgh on Saturday, June 17, 2017.

Cubs pitcher Jake Arrieta warms up before the start of a game against the Marlins at Wrigley Field on Tuesday, June 6, 2017.

Cubs pitcher Jake Arrieta, center, helps paint a banner for graduation with principal Michael Herring, left, and eighth grader Tadhg Quinn, 14, right, and others in the auditorium at Jahn School of Fine Arts in Chicago on Monday, May 22, 2017.

Cubs starting pitcher Jake Arrieta finishes the sixth inning Sunday, May 21, 2017, at Wrigley Field.

Cubs starting pitcher Jake Arrieta delivers to the Brewers in the first inning Sunday, May 21, 2017, at Wrigley Field.

Jake Arrieta in the first inning against the Rockies on May 9, 2017.

Cubs starting pitcher Jake Arrieta bats in the fourth inning against the Rockies on May 9, 2017.

Cubs starting pitcher Jake Arrieta winds up during the first inning against the Phillies at Wrigley Field on May 3, 2017.

Cubs starting pitcher Jake Arrieta delivers to the Red Sox in the first inning at Fenway Park on April 28, 2017.

Jake Arrieta hits an RBI triple off against the Reds on April 22, 2017.

Jake Arrieta stands on the mound as the Reds’ Joey Votto runs the bases on a three-run home run in the first inning on April 22, 2017, in Cincinnati.

Jake Arrieta delivers to the Pirates in the first inning at Wrigley Field on April 15, 2017.

Jake Arrieta holds his silver slugger award presented to him before a game at Wrigley Field on April 14, 2017.

Jake Arrieta shakes hands with Jimmy Thurman as Arrieta receives his 2016 World Series ring on April 12, 2017.

Jake Arrieta throws during the first inning against the Cardinals on April 4, 2017.

Jake Arrieta warms up in the first inning of a spring training game against the Diamondbacks on Thursday, March 23, 2017, in Scottsdale, Ariz.

Cubs manager Joe Maddon, left, smiles as he congratulates Jake Arrieta on hitting a home run against the Diamondbacks during the third inning of a spring training game Thursday, March 23, 2017, in Scottsdale, Ariz.

Jake Arrieta pitches in the first inning Angels during the spring training game at Tempe Diablo Stadium on March 6, 2017.

Jake Arrieta bunts during a spring training practice on Feb. 24, 2017.

Addison Russell and Jake Arrieta talk before working out during spring training on Feb. 16, 2017.

Pitcher Jake Arrieta high-fives fans on the first day of the Cubs Convention at the Sheraton Grand Chicago on Friday, Jan. 13, 2017.

Jake Arrieta on Friday, Nov. 4, 2016, as the Chicago Cubs celebrate their World Series championship with a rally in Grant Park.

Jake Arrieta, center right with a finger in the air, and Kyle Schwarber, far left, wave to fans during a parade outside Wrigley Field honoring the World Series champions on Nov. 4, 2016.

ake Arrieta and his family walk to the mound for a photo in the rain Thursday, Nov. 3, 2016, after Game 7 of the World Series at Progressive Field in Cleveland.

Jake Arrieta and Anthony Rizzo following the Cubs’ World Series title at Progressive Field in Cleveland in the early hours of Thursday, Nov 3, 2016.

Jake Arrieta throws in the sixth inning against the Indians in Game 6 of the World Series Tuesday, Nov. 1, 2016, at Progressive Field in Cleveland.

Jake Arrieta reacts after giving up an RBI single to Indians first baseman Mike Napoli as Indians second baseman Jason Kipnis scores in the fourth inning during Game 6 of the World Series at Progressive Field in Cleveland on Tuesday, Nov. 1, 2016.

Jake Arrieta works the first inning Tuesday, Nov. 1, 2016, during Game 6 of the World Series at Progressive Field in Cleveland.

Jake Arrieta before Game 5 of the World Series at Wrigley Field on Oct. 30, 2016.

Jake Arrieta listens to the national anthem before Game 3 of the World Series at Wrigley Field on Oct. 28, 2016.

Jake Arrieta after pitching the fifth inning of Game 2 of the World Series at Progressive Field on Oct. 26, 2016.

Jake Arrieta delivers in the first inning of Game 2 of the World Series at Progressive Field on Oct. 26, 2016.

Jake Arrieta stands on the pitcher’s mound during the sixth inning of Game 2 of the World Series at Progressive Field on Oct. 26, 2016.

Jake Arrieta throws against the Indians during the sixth inning of Game 2 of the World Series at Progressive Field on Oct. 26, 2016.

Jake Arrieta during media availability before Game 1 of the World Series at Progressive Field on Oct. 24, 2016.

Brittany and Jake Arrieta after the Chicago Cubs clinched against the Los Angeles Dodgers, during game 6 of the NLCS, at Wrigley Field, in Chicago, on Saturday, Oct. 22, 2016. (Nuccio DiNuzzo/Chicago Tribune)  (Nuccio DiNuzzo / Chicago Tribune)

Jake Arrieta works against the Dodgers in the first inning during Game 3 of the National League Championship Series at Dodger Stadium on Oct. 18, 2016.

Jake Arrieta in the dugout in the sixth inning against the Dodgers in Game 3 of the NLCS at Dodger Stadium on Oct. 18, 2016.

Jake Arrieta faces the Dodgers’ Chase Utley in the first inning during Game 3 of the NLCS at Dodger Stadium on Oct. 18, 2016. Utley grounded out.

Jake Arrieta talks to reporters during a news conference ahead of Game 3 of the NLCS against the Dodgers on Oct. 17, 2016.

Jake Arrieta warms up during batting practice before Game 1 of the NLCS against the Dodgers on Oct. 15, 2016.

Pitcher Jake Arrieta celebrates with teammates in the locker room after Game 4 of baseball’s National League Division Series against the San Francisco Giants in San Francisco Oct. 11, 2016.

Starting pitcher Jake Arrieta is greeted by teammates in the dugout after the sixth inning Oct. 10, 2016 in Game 3 of their National League Division Series at AT&T Park.

Jake Arrieta reacts after hitting a three-run home run off of Madison Bumgarner during the second inning of Game 3 of baseball’s National League Division Series in San Francisco Oct. 10, 2016.

Starting pitcher Jake Arrieta hits a 3-run home run in the second inning Oct. 10, 2016 in Game 3 of their National League Division Series at AT&T Park.

Starting pitcher Jake Arrieta delivers Oct. 10, 2016 in Game 3 of their National League Division Series at AT&T Park.

Jake Arrieta walks to the dugout after the Cubs defeated the Giants in Game 2 of the NLDS at Wrigley Field on Oct. 8, 2016.

Jake Arrieta warms up before the Chicago Cubs play the Giants in Game 1 of the National League Division Series at Wrigley Field on Oct. 7, 2016.

Jake Arrieta delivers in the second inning against the Pirates on Sept. 28, 2016.

Jake Arrieta gets a high-five from his teammates after pitching during the 7th inning against the Cardinals at Wrigley Field on Sept. 23, 2016.

Jake Arrieta checks the runner at first during the sixth inning against the Cardinals on Sept. 23, 2016.

Jake Arrieta tips his hat to the crowd before a game at Wrigley Field on Sept. 16, 2016. The Cubs clinched the NL Central the night before.

Jake Arrieta takes a photo with his family while celebrating a National League Central division title at Wrigley Field on Sept. 16, 2016.

Jake Arrieta pitches against the Giants during the first inning at Wrigley Field on September 3, 2016.

Jake Arrieta reacts after giving up a three-run home run to the Pirates’ Gregory Polanco during the sixth inning at Wrigley Field on August 29, 2016.

Jake Arrieta tags out the Pirates’ Starling Marte at home plate on a run down in the fifth inning on Aug. 29, 2016.

Cubs starting pitcher Jake Arrieta delivers a pitch against the Pirates during the first inning of their game at Wrigley Field on Aug. 29, 2016.

Jake Arrieta walks to the team bus dressed in onesies after their game against the Dodgers at Dodger Stadium on Aug. 28, 2016.

Jake Arrieta pitches during the first inning against the Padres at PETCO Park on August 23, 2016.

Cubs starting pitcher Jake Arrieta pitches in the 6th inning against the Brewers at Wrigley Field on Aug. 18, 2016.

Jake Arrieta pitches against the Cardinals during the first inning at Wrigley Field on August 12, 2016.

Cubs starting pitcher Jake Arrieta during batting practice before the game against the Angels at Wrigley Field on Aug. 9, 2016.

Cubs starting pitcher Jake Arrieta before the start of a game against the Angels at Wrigley Field on Aug. 9, 2016.

Jake Arrieta pitches against the Athletics during the first inning at the Oakland Coliseum on August 6, 2016.

Cubs starting pitcher Jake Arrieta throws against the Mariners during the first inning on July 30, 2016.

Fans watch Cubs starting pitcher Jake Arrieta warm up on July 25, 2016 at U.S. Cellular Field.

Jake Arrieta returns to the mound after giving up a three-run home run to the White Sox’s Todd Frazier during the sixth inning on July 25, 2016.

Jake Arrieta looks up to the scoreboard replay during the fourth inning against the White Sox on July 25, 2016.

Jake Arrieta is tagged out at home plate by Mets catcher Rene Rivera after Arrieta tried to score on a single by Tommy La Stella in the fourth inning at Wrigley Field on July 19, 2016.

Cubs starting pitcher Jake Arrieta stands on the mound in the fifth inning against the Mets at Wrigley Field on July 19, 2016.

Jake Arrieta delivers to the Mets at Wrigley Field on July 19, 2016.

Jake Arrieta is announced at the All-Star game alongside Jon Lester and the Reds’ Adam Duvall on July 12, 2016.

Cubs All-Stars Dexter Fowler, Ben Zobrist, Jake Arrieta, Addison Russell, Kris Bryant, Jon Lester and Anthony Rizzo on July 12, 2016 in San Diego.

Jake Arrieta and his son Cooper watch the Home Run Derby at Petco Park in San Diego on July 11, 2016.

Jake Arrieta with his son Cooper during the National League’s batting practice before the Home Run Derby at Petco Park in San Diego on July 11, 2016.

Jake Arrieta delivers during the fourth inning against the Pirates in Pittsburgh on Friday, July 8, 2016.

Jake Arrieta walks to the dugout before a game against the Pirates in Pittsburgh on July 8, 2016.

Cubs All-Stars Ben Zobrist, Addison Russell, Dexter Fowler, Kris Bryant, Jake Arrieta, Jon Lester and Anthony Rizzo pose for a photograph before a game against the Braves at Wrigley Field on July 7, 2016.

Jake Arrieta is pulled from the game in the sixth inning against the Mets as Cubs fans cheer for him at Citi Field on July 2, 2016.

Jake Arrieta delivers a pitch in the first inning against the Mets at Citi Field on July 2, 2016.