Canada fought back to end day one of their Davis Cup World Group tie against Great Britain level at 1-1 in Ottawa.
Dan Evans beat 17-year-old Denis Shapovalov 6-3 6-3 6-4 in the opening singles, before Vasek Pospisil upset Kyle Edmund 6-4 6-1 7-6 (7-3).
Pospisil, ranked 86 places below Edmund at 133rd in the world, overcame a leg injury to level the best-of-five tie.
Jamie Murray and Dom Inglot are scheduled to face Daniel Nestor and Pospisil in Saturday's doubles contest.
The two nations are missing their leading players as world number one Andy Murray recuperates following the Australian Open, while Canada's world number four Milos Raonic is injured.