April 11, 2018 - Houston, TX, U.S. - HOUSTON, TX - APRIL 11: Ivo Karlovic (CRO) returns a shot during his match against Denis Kudla (USA) during the 2018 US Men's Clay Court Tennis Championships on April 11, 2018 at River Oaks Country Club, Houston, Texas. (Photo by Ken Murray/Icon Sportswire) (Credit Image: © Ken Murray/Icon SMI via ZUMA Press)