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National Bank Open (Canadian Open tennis) explained

The National Bank Open (Omnium Banque Nationale) is Canada's tennis tournament in Montreal and Toronto, run by Tennis Canada. Check the facts and work out a title-run chance.

Example

The tournament in facts

Level: Men: ATP Masters 1000. Women: WTA 1000. Organised by Tennis Canada.
Source: nationalbankopen.com (checked Oct 28, 2026).
Two cities: Men and women play at the same time in two cities and swap every year. In 2027: women in Montreal (IGA Stadium), men in Toronto (Sobeys Stadium).
Source: nationalbankopen.com (checked Oct 28, 2026).
Dates 2027: July 31 – August 12, 2027 in both cities; finals on Thursday, August 12.
Source: nationalbankopen.com (checked Oct 28, 2026).
Draw: 96 players in each singles main draw, 7 rounds over 12 days; the 32 seeded players skip the first round. Qualifying: 32 players in one day.
Source: nationalbankopen.com (checked Oct 28, 2026).
Surface: Hard courts (Sobeys Stadium: hard, outdoors).
Source: sobeysstadium.com (checked Oct 28, 2026).
Match format: Singles: best of three sets, a 7-point tie-break at 6–6 in every set (ATP and WTA rules).
Source: atptour.com, wtatennis.com, itftennis.com (checked Oct 28, 2026).
Champions 2026: Ben Shelton (Montreal) and Iga Swiatek (Toronto).
Source: nationalbankopen.com (checked Oct 28, 2026).

One match, one title run

Player A wins a point on serve66.0%Opponent wins a point on serve62.0%

Player A is

Wins one NBO match (best of 3)69.1%fair 1.45

Same edge, best of 573.4%fair 1.36

Player A wins about 69 of 100 such matches. A title run means 6 wins in a row: if every opponent were this strong, A would lift the trophy 10.9% of the time (about 1 in 9.2).

Still in the draw after each win

69%1

48%2

33%3

23%4

16%5

11%6

Bottom row: wins in a row. Real draws get harder round by round; this shows only how quickly even a big favourite’s title chance shrinks.

How it is calculated

One match: each player wins a point on serve with a fixed chance, and we follow every game, tie-break and set exactly in the best-of-three format. The best-of-five figure uses the same two numbers.

Title run: the chance of one match raised to the number of wins needed (a top seed with a bye plays one round fewer). It assumes every opponent is as strong as the one you set – real draws are not.

Point-by-point match calculator →Tennis odds to chances →

Woman holding a small Canadian flag and a tennis racket

The next tournament at a glance

Dates

Jul 31, 2027 – Aug 12, 2027

Women and men play on the same days. Finals day: Thursday, August 12, 2027.

Women: WTA 1000

Montreal

Played at IGA Stadium on hard courts.

Men: ATP Masters 1000

Toronto

Played at Sobeys Stadium on outdoor hard courts.

Main draw

96 players

7 rounds over 12 days. The top seeds skip the first round.

How the draw works

Qualifying32 players play on the first day for places in the main draw.
First roundUnseeded players and qualifiers play. The 32 top seeds have a bye.
Second roundThe seeds enter and face the first-round winners.
Third and fourth roundsOne loss ends the run. The field halves every round.
Quarter-finalsEight players are left in each event.
Semi-finalsFour players are left. The winners reach the final.
FinalPlayed under the lights on Thursday, August 12, 2027.

Best of three vs best of five

Best of three (this event)

All singles matches, finals included, in the ATP and WTA events
Sets go to 6 games, with a 7-point tie-break
Fewer sets, so an upset is more likely

Best of five (for comparison)

Not used at the National Bank Open
The calculator above shows it with the same serve edge
More sets give the stronger player a higher match chance
Try other serve numbers in the match probability calculator

What a title run takes

Player	Wins needed	Chance per match	Title run chance
Top seed (bye)	6	69.1%	10.9%
Unseeded (main draw)	7	69.1%	7.5%

Title chance = match chance multiplied once per win. Example: serve points won 66% vs 62%, same opponent every round – so it is optimistic.

Sources

National Bank Open – official site (Tennis Canada) · checked Oct 28, 2026
National Bank Open – The Ultimate Ticket Guide to the 2027 NBO · checked Oct 28, 2026
National Bank Open – 2026 Montreal final · checked Oct 28, 2026
National Bank Open – 2026 Toronto final · checked Oct 28, 2026
Sobeys Stadium (Tennis Canada) · checked Oct 28, 2026
Stade IGA (Tennis Canada) · checked Oct 28, 2026
ATP Official Rulebook 2025 – Chapter I, ATP Circuit Regulations · checked Oct 28, 2026
WTA – 2026 Official Rulebook · checked Oct 28, 2026

Questions

Where is the next National Bank Open played?

The women's WTA event is in Montreal at IGA Stadium. The men's ATP event is in Toronto at Sobeys Stadium. Both run Jul 31, 2027 – Aug 12, 2027.

Do men and women play in the same city?

No. They play on the same days in different cities, and the cities swap every year.

Is the National Bank Open a Grand Slam?

No. The men's event is an ATP Masters 1000 and the women's event is a WTA 1000. Both are run by Tennis Canada.

How are National Bank Open odds worked out?

A title price covers every match a player must win. Turn the price into a percentage with the odds converter. See tennis betting explained for match and set markets.

What is the Omnium Banque Nationale?

It is the French name of the National Bank Open. It is the same tournament, in Montreal and Toronto.