Switzerland’s Roger Federer (L) and Spanish Rafael Nadal (R) of the Team Europe in action during the Laver Cup tennis tournament in Prague, Czech Republic, 23 September 2017. The first Laver Cup is held in Prague, Czech Republic, from 22 to 24 September 2017. It is a three-day tournament pitting a team of the six best tennis players from Europe against six opponents from the rest of the world. The tournament has been named in honor of Australian tennis legend Rod Laver. EPA-EFE/MILAN KAMMERMAYER

Switzerland’s Roger Federer (R) and Spanish Rafael Nadal (L) of the Team Europe in action during the Laver Cup tennis tournament in Prague, Czech Republic, 23 September 2017. The first Laver Cup is held in Prague, Czech Republic, from 22 to 24 September 2017. It is a three-day tournament pitting a team of the six best tennis players from Europe against six opponents from the rest of the world. The tournament has been named in honor of Australian tennis legend Rod Laver. EPA-EFE/MILAN KAMMERMAYER

Switzerland’s Roger Federer (R) and Spanish Rafael Nadal (L) of the Team Europe in action during the Laver Cup tennis tournament in Prague, Czech Republic, 23 September 2017. The first Laver Cup is held in Prague, Czech Republic, from 22 to 24 September 2017. It is a three-day tournament pitting a team of the six best tennis players from Europe against six opponents from the rest of the world. The tournament has been named in honor of Australian tennis legend Rod Laver. EPA-EFE/MILAN KAMMERMAYER