Betts taken to hospital for tests after flipping over Fenway wall on controversial HR

Boston Red Sox center fielder Mookie Betts exited Tuesday's game with a possible concussion after making a spectacular leaping catch that was overturned in the sixth inning.

The speedy Betts tracked Chicago White Sox slugger Jose Abreu's deep fly ball over the fence in right center at Fenway Park before securing the catch and flipping over the wall.

(Courtesy: MLB.com)

Upon review, Abreu was credited with a two-run homer after umpires ruled Betts dropped the ball when he fell into the dugout. The official Major League Baseball Rules state:

It is not a catch, however, if simultaneously or immediately following his contact with the ball, he collides with a player, or with a wall, or if he falls down, and as a result of such collision or falling, drops the ball. It is not a catch if a fielder touches a fly ball which then hits a member of the offensive team or an umpire and then is caught by another defensive player. If the fielder has made the catch and drops the ball while in the act of making a throw following the catch, the ball shall be adjudged to have been caught. In establishing the validity of the catch, the fielder shall hold the ball long enough to prove that he has complete control of the ball and that his release of the ball is voluntary and intentional.

Betts was attended to by the training staff outside the Red Sox dugout as the play was reviewed, and replaced by Rusney Castillo. Bullpen coach Dana LeVangie told Pete Abraham of The Boston Globe that the sound of Betts hitting the ground "was a lot louder than you would think."

"He has symptoms consistent with a concussion," manager John Farrell told reporters after Boston's 9-4 loss. "He's being examined further right now. At the minimum, he'll have to go through the major league protocol to be cleared. Before stating exactly what he has, we've got to get some further information from the tests."

Betts was taken to Massachusetts General Hospital after the game for a CT scan, according to Abraham.