Portuguese tennis umpire Carlos Ramos attends the draw ahead of the Davis Cup semifinal matches between Croatia and United States in Zadar, Croatia, Thursday, Sept. 13, 2018. Ramos, the chair umpire who penalized Serena Williams a game in the U.S. Open final has been assigned to officiate the Davis Cup semifinal matches between the United States and Croatia. (AP Photo/Darko Bandic), APTOPIX