Shapovalov, ranked a career-high 15th in the world, finished off No. 32 Fritz with an ace.
Canada edged Italy after Vasek Pospisil topped Fabio Fognini 7-6 (5), 7-5 and Denis Shapovalov outlasted Matteo Berrettini 7-6 (5), 6-7 (3), 7-6 (5) after almost three hours.
"The only negative in my opinion is we are just starting the last match and it's 12.45am", Nadal said ahead of the doubles. "He's had such an unbelievable season, and he's playing some great tennis".
The last time France played a Davis Cup tie around 60,000 fans flocked to Lille's Stade Pierre Mauroy soccer stadium over three days to watch them lose the 2018 final to Croatia.
"But to play the Davis Cup and you walk out and the atmosphere is like this and it is so hectic". Canada had a match record of 3-70 against the Americans entering Tuesday.
Following the passing of the new proposals in August 2018, 1987 Wimbledon champion Pat Cash said organisers were "fooling themselves" if they thought the world's best players would turn up for a team tournament at the end of an already energy-sapping year.
"That is why the ATP and the ITF are trying to create more events because if they continue to go down the path they are right now the sport will die out. It's going to be a great week", said the 35-year-old Darcis, who is planning to retire next year. Pospisil was a late replacement against Italy for Montreal's Auger-Aliassime, who was recovering from an ankle injury.
Having saved the only break point, Griekspoor then clinched the set with the first mini-break of the tie-break, pouncing on a Murray second serve and finishing it off with a forehand victor. But Pospisil rebounded to finish it off. "I won't come next year". "I mean, I had surgery in the lower back. The way that Alex is playing and I know I can beat every single person in this competition". You never get really a chance to, other than in the Olympics, to really sit next to all the elite athletes from their sports and dine with them and just exchange experiences and knowledge and everything. The Scot is being cautious this Davis Cup, with the potential to play a lot of tennis in Madrid. There, Borna still couldn't do anything on the return, getting broken in the first game and once again at 3-5 to push Rafa over the top and Spain into the last eight.
The newly-established Davis Cup format divides 18 teams into six groups, with the group winners and two best-placed runners-up qualifying for the quarterfinals. Canada will face either Belgium or Australia in the next round.
The result leaves the United States needing to beat Italy on Wednesday to have a chance of advancing to the knockout stage.
Also Monday, Russia defeated Croatia 3-0 in Group B play while Belgium beat Colombia 2-1 in Group D play.
"We are going to go out there (Wednesday) and try to win the first one and try to put ourselves in position to do that", Fish said.