Thanasi Kokkinakis Pictures
PRAGUE, CZECH REPUBLIC - SEPTEMBER 22: (L-R) Patrick Mcenroe, Sam Querrey, Nick Kyrgios, Thanasi Kokkinakis, and Jack Sock of Team World reacts as Dominic Thiem of Team Europe plays his singles match against John Isner of Team World on the first day of the Laver Cup on September 22, 2017 in Prague, Czech Republic. The Laver Cup consists of six European players competing against their counterparts from the rest of the World. Europe will be captained by Bjorn Borg and John McEnroe will captain the Rest of the World team. The event runs from 22-24 September. (Photo by Clive Brunskill/Getty Images for Laver Cup)