Nestor, who played his 51st Davis Cup match and came in with a 32-11 doubles record, is 43rd amongst doubles players in the current global rankings, with Pospisil sitting in 111th. The 18-year-old also scalped Juan Martin Del Potro and Jo Wilfred Tsonga in his astonishing rise in world tennis in the last few months.
Ramkumar Ramanathan faced a stiff challenge from Canada's Bradley Schnur but held his nerve to win 5-7, 7-6 (4), 7-5, 7-5 in the first match of India's World Group Play-off tie against Canada in Edmonton, on Saturday.
Singles play wraps up the tie on Sunday with Shapovalov and Schnur facing each other's previous opponents from Friday's matches.
If the idea of many might have been that India would be a walkover against Canada in this weekend's David Cup tie that disappeared from the git go.
Schnur won the first set before dropping the next three.
Ramkumar had defeated Schnur in a tough four-setter in the opening match of the play-off to give India a 1-0 lead.
The Indian team of Rohan Bopanna (ranked No. 19) and Purav Raja will have every chance of notching the win and putting the pressure squarely back on Shapovalov, whose will open Day 3 with a singles match - the fourth of five matches here - at 3 p.m. He then secured the match's first break in the seventh game of the second set to take 2-0 lead. "It was my first (best of five game)", Schnur said after the match.
After beating Rafael Nadal at the recent Rogers Cup, it was just another day at the office for Shapovalov. "We only had best-of-threes in college". I think that is what's impressing a lot of the coaches and players on tour. "That was the most fun I've had in tennis with that crowd", he said.
Bhambri won the fourth set 6-4 and suddenly Canada in deep trouble going into a fifth set.
However, Yuk Bhambri won a break point of his own and forced the third set to a tie-break.
He won his first two sets 7-6 (7-2) and 6-4 against India No. 2 Yuki Bhambri.
Yuki turned the match on its head after being down by two sets and a match point in the third set but eventually lost 6-7 (2) 4-6 7-6 (6) 6-4 1-6 to Denis Shapovalov after an audacious performance in a three hours and 52 minutes battle. You might assume that Canadians Daniel Nestor and Vasek Pospisil would be favoured based on their historic doubles success, but in fact Nestor has lost his last five matches and Pospisil is nursing a bad back here.