Jeffrey Alan "Jac" Caglianone (born February 9, 2003 in Tampa, FL) is an American professional baseball first baseman and outfielder for the Kansas City Royals of Major League Baseball. He was selected by the Royals with the sixth overall pick in the 2024 MLB Draft. Caglianone played college baseball for the Florida Gators at the University of Florida as an infielder and pitcher.

Caglianone grew up in Tampa, Florida, and attended Henry B. Plant High School. As a junior in 2020, he played in Perfect Game's All-American Classic for top high school players held at the Chickasaw Bricktown Ballpark in Oklahoma City, Oklahoma, and was named a Florida Athletic Coaches Association All-American and the MLB Network/Sirius XM Two-Way Player of the year. As a senior, he batted .371 with three home runs and posted a 2.44 ERA with two saves and 65 strikeouts over 37+1⁄3 innings pitched. Caglianone tore the ulnar collateral ligament in his left elbow while playing in a postseason All-Star game after his senior season, subsequently undergoing Tommy John surgery.

At Florida, Jac was named the NCBWA Player of the Month for February after collecting 15 hits in 35 at-bats with seven home runs and striking out 15 batters over 11+1⁄3 innings pitched. He broke Florida's single-season home run record after hitting his 27th of the year and finished with 33. In his junior year in 2024, he hit home runs in nine straight games, including one against Jacksonville that traveled an estimated 516 feet (157 m), farther than any home run recorded in the major leagues since Statcast was introduced in 2015. This also tied the record for most home runs hit in consecutive games at the NCAA level. Caglianone also surpassed Matt LaPorta for the most career home runs by a Florida player, with 75. As a result of his power at the plate, during the 2024 Men's College World Series in Omaha, Nebraska, his opponents would often utilize an infield shift during his plate appearances, with the third baseman positioned as a fourth outfielder.

After his junior season at Florida, he was drafted by the Kansas City Royals with the 6th overall pick in the 2024 MLB Draft. He signed with the Royals on July 23 and received a $7.21 million signing bonus. Caglianone was assigned to the Quad Cities River Bandits of the High-A Midwest League to begin his professional career. For the 2025 season, Caglianone was promoted to the Northwest Arkansas Naturals of the Double-A Texas League.  On April 10, he recorded an opposite-field  single that at the time was the 12th-hardest-hit ball ever recorded during the Statcast era at 120.9 EV - the second hardest hit ball in the pros in 2025 (behind O'Neil Cruz) . On April 25, he played in right field, his first time in the college or the minor league level being in the outfield. On May 18, Caglianone was promoted to the Omaha Storm Chasers of the Triple-A International League, as the Royals organization felt he was ready to be challenged with a higher level of competition, especially as a hitter; in 38 games with Northwest Arkansas, he hit .322/.394/.553, with eight doubles, nine home runs, and 43 RBIs, drawing 19 walks and striking out 37 times in 175 plate appearances.

On June 1, Caglianone got called up to the big leagues for the first time, and made his debut on June 3, 2025 vs. the St. Louis Cardinals.

(excerpted from Baseball Almanac, BR Bullpen & Wikipedia)