That season, Grichuk batted .435 with 18 home runs and 45 RBI, leading the Mustangs to a school record 29 wins and a Regional Final appearance.

[6] In October 2013, Rawlings and MiLB announced Grichuk was the recipient of the Minor League Gold Glove Award for right field.

On May 21, he showed the authorities what he could do with a big game-winning home run versus the Colorado Springs Sky Sox, giving an anonymous fan an autograph after the game.

[14] On June 7, he hit his first major league home run off Toronto Blue Jays' starter Mark Buehrle in a 5–0 victory.

[15] Grichuk produced a .944 on-base plus slugging percentage (OPS) in 44 spring training at bats in 2015 and made the major league club as a fifth outfielder.

[16] While lifting weights, he strained his lower back, halting his play on April 16 and prompting the Cardinals to place him on the 15-day DL.

[19] When Matt Holliday went on the DL in early June, that opened Grichuk's first legitimate opportunity for regular playing time in the major leagues, including all three outfield positions.

[22] On August 5 against the Cincinnati Reds, he doubled in the sixth inning and hit the game-winning home run in the top of the 13th at Great American Ball Park in a 4–3 game.

[32] On April 2, 2017, Opening Night versus the defending World Series champion Chicago Cubs at Busch Stadium, Grichuk homered and hit a walk-off bases-loaded single in the bottom of the ninth.

[33] On January 19, 2018, the Cardinals traded Grichuk to the Toronto Blue Jays in exchange for pitchers Dominic Leone and Conner Greene.

On March 30, Grichuk hit his first home run as a Blue Jay, which came on the first pitch he saw from Masahiro Tanaka in the second inning of a 4–2 loss to the New York Yankees.

[49] In 2014, Randal Grichuk was projected with potential as a power hitter in the major leagues possessing the athleticism and preparedness to handle center field well.

At the plate, his most evident ability is to hit the ball with power and loft to all fields, easily give him potential for 20 or more home runs a season.

[52] According to Baseball America's Kary Booher, Grichuk possesses an athletic frame with average arm and enough range to profile into an outfield corner slot.

As of August 11, 2015, the average exit velocity of all his batted balls on the season was seventh in the major leagues at 93.17 miles per hour (149.94 km/h).

[54] Originally projected to be a first baseman, Grichuk expanded his versatility to the outfield thanks in part to extra preparation and a sleek and proportioned athletic frame.

For what he lacks in the classic speed of center fielders, he mitigates with robust jumps and precise route running and positioning to easily anticipate the trajectory of – and catch – balls hit to the outfield.

His arm strength and range allow him the ability to cut off runners at times from extra bases on the occasional plays for which he did not properly position himself.