Rafael Nadal and Roger Federer of Team Europe watch the singles match between Dominic Thiem of Team Europe and 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. (Sept. 21, 2017 - Source: Julian Finney/Getty Images Europe)
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