È stato un primo turno di Laver Cup positivo per la selezione europea guidata da Björn Borg, che si è assicurata il doppio vantaggio grazie alle vittorie di Cilic e Thiem. Nella partita di apertura, il croato Marin Cilic (ATP 5) ha regalato il primo punto alla squadra del Vecchio Continente, sconfiggendo con un doppio 7-6 (7/3 7/0) lo statunitense Frances Tiafoe (72). Ci è voluto il terzo set di tie-break (come in una partita di doppio) per risolvere la sfida tra Dominic Thiem (7) e John Isner (17) in favore dell'austriaco con il punteggio di 10/7.
In serata, sul terreno veloce della O2 Arena di Praga si sfideranno dapprima il tedesco Alexander Zverev (4) ed il 18enne canadese Denis Shapovalov (51). A chiudere la serata sarà poi il primo doppio, con Rafael Nadal (1) e Tomas Berdych (19) a sfidare per il team Europa la coppia australiano-americana formata da Nick Kyrgios (20) e Jack Sock (21).
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