It's a move that surprised a lot of fans around the league, considering not only has Simpson become the base-stealing star with the best speed in Major League Baseball, but he'd also been seeing the ball well.
He was slashing a solid .285/.315/.632 in 35 games for the Rays this season while racking up 11 RBI and 19 stolen bases.
To put that into perspective, before being sent down, Simpson was third in the MLB in stolen bases behind Luis Robert Jr. (21) and Bobby Witt Jr. (20), both of whom have played over 50 games this season to Simpson's 35.
But Simpson wasn't just making plays with his legs or his bat, he was also making Gold Glove-caliber plays in centerfield.
Jake Mangum
Make no mistake, Mangum is a stellar rookie himself.
Before getting hurt, he was slashing 338/.384/.781 with seven RBI and eight stolen bases in 21 games.
The 29-year-old is finally getting his shot in the majors. So, best believe he'll do everything to make sure he doesn't see another day of minor league ball.
The Tampa Bay Rays are currently second in the American League East division with a 29-27 record heading into Friday's game against the Houston Astros.