Charles Barkley knows who Jayson Tatum's first call should be when it comes to rehabbing a ruptured Achilles tendon.

Tatum's brilliant tenure with the Celtics took a painful turn Monday night. It's a reminder of how quickly an athlete's fortunes can change.

Jayson Tatum suffered a torn Achilles tendon during Monday night's Game 4 of the Eastern Conference semifinal series between the Boston Celtics and New York Knicks. The Celtics star left the game late in the fourth quarter after he went down on the court from the non-contact injury.

Jayson Tatum #0 of the Boston Celtics lays on the ground after being injured against the New York Knicks during the fourth quarter in Game Four of the