He owns one of the most uncomplicated yet deadly forehands in the game. Here is The Tower of Tandil, Juan Martin del Potro, practicing with Alexander Zverev at the 2018 U.S. Open.
Juan Martin hits through the ball on the forehand with an Eastern grip. He’s also added a very effective slice to the repertoire since recovering from left wrist injury a few years ago. His long, arduous comeback is a feel good story as he nearly called it quits in 2015. Juan Martin was the only man outside the “Big Four” to have won a Grand Slam between the 2005 Roland Garros and 2013 U.S. Open. Delpo has all the weapons to beat anyone on tour, and needs only the blessing of health.
https://www.youtube.com/watch?v=7ZQrVpnSeU8
