Wade Davis started his Major League career as a pitcher for the Tampa Bay Rays in 2009. He had a good start, winning 12 games and losing 10 in 2010, and a similar season in 2011. However, in 2012 the Rays decided to move him to the bullpen where he found more success, lowering his ERA to 2.43 over 70.1 innings. After the season, he was traded to the Kansas City Royals where he became a well-known player.

In 2013, Davis returned to the rotation but struggled with a high ERA. The Royals moved him back to the bullpen in 2014, where he excelled as a set-up man, not the main closer. That year, he had a great performance with a 1.00 ERA and 0.847 WHIP, earning him eighth place in the Cy Young voting. Davis also helped the Royals reach the World Series by winning two games in the playoffs.

Davis had an even better year in 2015, helping the Royals win the World Series. He finished sixth in the Cy Young voting, going 8-1 with a 0.94 ERA and 0.787 WHIP. In the playoffs, he earned the Babe Ruth Award by recording four saves, 18 strikeouts, and no earned runs over 10.2 innings. Davis was a critical part of the championship-winning team and had an excellent performance throughout the season.

After another good year with the Royals, Davis was traded to the Chicago Cubs, where he became an All-Star in his only season there. He then signed with the Colorado Rockies in 2018, where he had a strange year. Although he led the National League in saves with 43, his ERA was 4.13. Unfortunately, he struggled with arm issues afterward and attempted a comeback with the Royals in 2021, but it was unsuccessful.

Despite the ups and downs of his career, Davis finished his career with 141 saves and a World Series ring that he earned with his excellent performance.