Jeremy Ross Jeffress (born September 21, 1987) is an American professional baseball pitcher for the Texas Rangers of Major League Baseball (MLB). Jeffress has also pitched in MLB for the Kansas City Royals, Toronto Blue Jays, and Milwaukee Brewers. He is one of the hardest throwers in the majors, with a career average fastball velocity of nearly 96 miles per hour.

Jeffress was the selected by the Milwaukee Brewers as the 16th overall pick in the 2006 Major League Baseball Draft. He signed a contract with a $1.55 million signing bonus in 2006.

In 2008, he started on the Brevard County Manatees' roster on the restricted list. On August 6, the Milwaukee Brewers organization announced that Jeffress was promoted to their Double-A team, the Huntsville Stars. He began the 2009 season with Huntsville, but struggled and was sent back to Brevard County in May 2009. At the beginning of the 2010 campaign, Jeffress was sent down to the Class A affiliate, the Wisconsin Timber Rattlers.

On July 1, 2010, Jeffress was called up to Class A-Advanced Brevard County, where he continued to throw out of the bullpen. He was later promoted to Huntsville. Jeffress was called up to the majors for the first time on September 1, 2010. He made his major league debut that evening, pitching one scoreless inning.

On December 18, 2010 Jeffress was traded to the Kansas City Royals with Alcides Escobar, Lorenzo Cain, and Jake Odorizzi for Zack Greinke and Yuniesky Betancourt. In spring training in 2011, Jeffress led the major leagues in wild pitches, with 5 in 11 innings. He got his first win as a Royal on April 5 against the Chicago White Sox.

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