| Men's doubles | |
|---|---|
| 2018 Winnipeg National Bank Challenger | |
| Champions |  Marc-Andrea Hüsler  Sem Verbeek |
| Runners-up |  Gerard Granollers Marcel Granollers |
| Score | 6–7(5–7), 6–3, [14–12] |
Luke Bambridge and David O'Hare were the defending champions but chose not to defend their title.
Marc-Andrea Hüsler and Sem Verbeek won the title after defeating Gerard and Marcel Granollers 6–7(5–7), 6–3, [14–12] in the final.
Gerard Granollers / Marcel Granollers (final)
Matt Reid / 
Yasutaka Uchiyama (withdrew) Marc-Andrea Hüsler / Sem Verbeek (champions) Jason Kubler / Bradley Mousley (semifinals)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | G Granollers M Granollers | 6 | 6 | ||||||||||||||||||||||||
 L Johnson  R Schneider | 4 | 3 | 1 | G Granollers M Granollers | 6 | 7 | |||||||||||||||||||||
 F Peliwo B Schnur | 6 | 3 | [10] | F Peliwo B Schnur | 4 | 5 | |||||||||||||||||||||
 E Leshem Y Takahashi | 4 | 6 | [7] | 1 | G Granollers M Granollers | 6 | 77 | ||||||||||||||||||||
| 4 | J Kubler B Mousley | 6 | 6 | 4 | J Kubler B Mousley | 4 | 62 | ||||||||||||||||||||
| WC | Pavel Krainik David Volfson | 0 | 3 | 4 | J Kubler B Mousley | w/o | |||||||||||||||||||||
| WC | A Galarneau B Sigouin | 2 | 3 | M Mmoh P Polansky | |||||||||||||||||||||||
| M Mmoh P Polansky | 6 | 6 | 1 | G Granollers M Granollers | 77 | 3 | [12] | ||||||||||||||||||||
A Harris  D Köpfer | 65 | 6 | [8] | 3 | M-A Hüsler S Verbeek | 65 | 6 | [14] | |||||||||||||||||||
 L Grigelis  S Napolitano | 77 | 0 | [10] | L Grigelis S Napolitano | 5 | 6 | [7] | ||||||||||||||||||||
| A Bega K Uchida | 1 | 3 | 3 | M-A Hüsler S Verbeek | 7 | 4 | [10] | ||||||||||||||||||||
| 3 | M-A Hüsler S Verbeek | 6 | 6 | 3 | M-A Hüsler S Verbeek | 614 | 6 | [11] | |||||||||||||||||||
| WC | JM Lin Nicaise Muamba | 4 | 6 | [7] |  Z Li G Soeda | 716 | 3 | [9] | |||||||||||||||||||
| Z Li G Soeda | 6 | 3 | [10] | Z Li G Soeda | 6 | 6 | |||||||||||||||||||||
 A Escoffier  L Miedler | 6 | 6 | A Escoffier L Miedler | 2 | 3 | ||||||||||||||||||||||
| Alt | Baptiste Crepatte J Menezes | 4 | 0 | ||||||||||||||||||||||||
František Čermák and Filip Polášek were the defending champions but decided not to participate.
Marcel Granollers and Marc López won the title by beating Robert Farah and Santiago Giraldo 6–4, 7–6 in the final.
Marcel Granollers and Marc López defeated Mahesh Bhupathi and Rohan Bopanna in the final, 7–5, 3–6, [10–3] to win the doubles tennis title at the 2012 ATP World Tour Finals.
Jerzy Janowicz and Jürgen Zopp were the defending champions but decided not to participate.
Dominik Meffert and Philipp Oswald defeated Jamie Delgado and Andreas Siljeström 3–6, 7–6(7–0), [10–7] in the final to win the title.
Simone Bolelli and Fabio Fognini were the defending champions, but they decided not to participate.
Marcel Granollers and Marc López won the title, defeating Pablo Cuevas and Horacio Zeballos in the final, 7–5, 6–4.
Nicolas Mahut and Vasek Pospisil were the defending champions, but Pospisil chose not to participate this year. Mahut played alongside Pierre-Hugues Herbert, but lost in the semifinals to Ivan Dodig and Marcel Granollers.
Brydan Klein and Dane Propoggia are the defending champions but chose to defend their title with different partners. Klein partnered Bradley Mousley and lost in the semifinals to Gerard and Marcel Granollers. Propoggia partnered Vijay Sundar Prashanth but lost in the first round to Andrew Harris and Luke Saville.
Bradley Mousley and Luke Saville were the defending champions but chose to defend their title with different partners. Mousley partnered Alex Bolt and successfully defended his title. Saville partnered Matt Reid but lost in the quarterfinals to Max Purcell and Andrew Whittington.
The 2018 Winnipeg National Bank Challenger was a professional tennis tournament played on outdoor hard courts. It was the 3rd edition, for men, and 6th edition, for women, of the tournament and part of the 2018 ATP Challenger Tour and the 2018 ITF Women's Circuit. It took place in Winnipeg, Manitoba, Canada between July 10 and July 15, 2018.
Denis Kudla and Daniel Nguyen were the defending champions but chose not to defend their title.
Gerard and Marcel Granollers were the defending champions but chose not to defend their title.
Sander Arends and Adil Shamasdin were the defending champions but chose not to defend their title.
Marc-Andrea Hüsler and Sem Verbeek were the defending champions but chose not to defend their title.
Matt Reid and Sergiy Stakhovsky were the defending champions but chose not to defend their title.
Gerard Granollers and Guillermo Olaso were the defending champions but chose not to defend their title.
Lloyd Harris and Dudi Sela were the defending champions but chose not to defend their title.
Max Purcell and Luke Saville were the defending champions but only Purcell chose to defend his title, partnering Jake Delaney. Purcell lost in the first round to Harri Heliövaara and Sem Verbeek.
Lorenzo Sonego defeated defending champion Laslo Đere in the final, 2–6, 7–6(7–5), 6–4 to win the men's singles title at the 2021 Sardegna Open. With the victory, Sonego became the first Italian in 15 years to capture an ATP Tour title on home soil.
Ruben Bemelmans and Daniel Masur were the defending champions but lost in the first round to Marc-Andrea Hüsler and Dominic Stricker.
Marc Polmans and Sergiy Stakhovsky were the defending champions but chose not to defend their title.
Marc-Andrea Hüsler and Kamil Majchrzak were the defending champions but chose not to defend their title.