Merrifield played college baseball at the University of South Carolina from 2008 to 2010. In the second game of the 2010 College World Series, Merrifield hit a game-winning RBI single in the bottom of the 11th inning to give South Carolina the championship. In his three years at South Carolina, he played in 195 games and hit .329/.389/.489 with 27 home runs.

Merrifield was drafted by the Kansas City Royals in the ninth round of the 2010 Major League Baseball Draft. He signed with the Royals and made his professional debut that season with the Burlington Bees. In 47 games he hit .253/.317/.409 and five home runs. In 2011 Merrifield played for the Wilmington Blue Rocks and started 2012 back with Wilmington. During the season, he was promoted to the Northwest Arkansas Naturals and also spent 2013 there. Merrifield returned to Northwest Arkansas to start 2014 and was promoted to the Omaha Storm Chasers during the season.

Merrifield made his major league debut with the Kansas City Royals on May 18, 2016, instantly batting in the top third of the lineup and soon taking the starting second baseman job from Omar Infante. On June 13, 2016, Whit hit both his first Major League triple and home run against the Cleveland Indians.

In early July 2016, a song and video tribute to Merrifield entitled, "Cool Whit" went viral on YouTube and Facebook, receiving coverage on local Kansas City radio and TV news. "Cool Whit" T-shirts were also circulating amongst Royals fans.

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Wikipedia