The World Group is the highest level of Davis Cup competition in 2017. The first-round losers will play in the Davis Cup World Group Play-offs, and the winners will progress to the quarterfinals and retain a place World Group stage of the competition in 2018.
Canada vs. Great Britain
Shapovalov defaulted the rubber and the tie after accidentally hitting a ball into the face of the chair umpire.
References
2017 Davis Cup World Group Wikipedia(Text) CC BY-SA