2018 Calgary National Bank Challenger

Country	Player	Rank	Seed
AUS	Jordan Thompson	105	1
CRO	Ivo Karlović	117	2
TPE	Jason Jung	123	3
ESP	Adrián Menéndez Maceiras	132	4
NOR	Casper Ruud	137	5
AUS	Alex Bolt	155	6
GBR	Jay Clarke	177	7
ECU	Roberto Quiroz	190	8

The following players received wildcards into the singles main draw:

• Steven Diez
• Alexis Galarneau
• Pavel Krainik
• Harrison Scott

The following players received entry into the singles main draw as alternates:

• Cem İlkel
• Stefan Kozlov

The following players received entry from the qualifying draw:

• Tom Fawcett
• Borna Gojo
• Vincent Millot
• Pablo Vivero González

The following player received entry as a lucky loser:

• Laurent Rochette

• Ivo Karlović def. Jordan Thompson 7–6^(7–3), 6–3.

• Robert Galloway / Nathan Pasha def. Matt Reid / John-Patrick Smith 6–4, 4–6, [10–6].