Bryans意外落败，美国队仍然以2:1暂时领先。
USA leads CROATIA 2-1
Venue: Tualatin Hills Tennis Center, Portland, USA (hard - outdoor)
Jack Sock (USA) d. Marin Cilic (CRO) 46 36 63 64 64
John Isner (USA) d. Borna Coric (CRO) 64 64 63
Ivan Dodig/Marin Cilic (CRO) d. Bob Bryan/Mike Bryan (USA) 62 26 62 64
John Isner (USA) v Marin Cilic (CRO)
Jack Sock (USA) v Borna Coric (CRO)
※ 引述《kour (FedEx Express!)》之铭言：
: USA leads CROATIA 2-0
: Venue: Tualatin Hills Tennis Center, Portland, USA (hard - outdoor)
: Jack Sock (USA) d. Marin Cilic (CRO) 46 36 63 64 64
: John Isner (USA) d. Borna Coric (CRO) 64 64 63
: Bob Bryan/Mike Bryan (USA) v Ivan Dodig/Marin Draganja (CRO)
: John Isner (USA) v Marin Cilic (CRO)
: Jack Sock (USA) v Borna Coric (CRO)
: Sock 输二赢三大逆转打败Cilic，Isner dominated Coric。
: 美国队拿下头两点单打，距离晋级只差一步！