Taylor Fritz of the US watches his return shot to Ricardas Berankis of Lithuania in the semifinals of the Memphis Open tennis championship at the Racquet Club of Memphis in Memphis, Tennessee, USA, 13 February 2016. EPA/TANNEN MAURY

Taylor Fritz of the US hits a return shot to Benjamin Becker of Germany in the quarterfinals of the Memphis Open tennis championship at the Racquet Club of Memphis in Memphis, Tennessee, USA, 12 February 2016. EPA/TANNEN MAURY

Taylor Fritz of the US in action against Kei Nishikori of Japan in the final match of the Memphis Open tennis championship at the Racquet Club of Memphis in Memphis, Tennessee, USA, 14 February 2016. EPA/TANNEN MAURY

18 year old wild card qualifier Taylor Fritz of the US reacts as defeats Ricardas Berankis of Lithuania in the semifinals of the Memphis Open tennis championship at the Racquet Club of Memphis in Memphis, Tennessee, USA, 13 February 2016. Fritz became the youngest American to reach an ATP semifinals since 1989. EPA/TANNEN MAURY

Taylor Fritz of the US hits a return shot to Michael Mmoh of the US in their round match of the Memphis Open tennis championship at the Racquet Club of Memphis in Memphis, Tennessee, USA, 09 February 2016. EPA/TANNEN MAURY