The left-handed Indian shocked the Canadian sixth seed 7-6(6) 2-6 6-3 in the opening round of the Euro 729,340 grass court event.
Prajnesh, who had won the decisive fifth rubber against Yibing Wu in the Davis Cup tie against China, has been in good nick in the last few months, winning his maiden ATP Challenger tournament.
The Indian singles player have made their presence felt on the Tour with their big wins, of late.
In August 2017, Bhambri had beaten World No. 22 and Citi Open defending champion Gael Monfils and in June 2017, Ramkumar Ramanathan had knocked out then world number eight Dominic Thiem, who ended as runner-up to Rafael Nadal at recently concluded French Open.
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