Champions League qualifying can be one of the most unpredictable competitions in the soccer calendar.
Clubs are at different stages of their pre-season preparations and squads have yet to take shape with plenty of time left in the transfer window.
However, that means that the profits can be great too, and one particular 27/1 shot looks especially tempting.
Neftchi Baku vs Olympiakos
There is something about matches in Baku that just seem to scream 'Champions League qualifiers' and it is Olympiakos' turn to experience it this time.
The Greek champions take a slender 1-0 lead to the Bakcell Arena, which leaves them in a strong position to progress.
It also means, though, that Neftchi will be encouraged to go for broke, and they can be a dangerous side when they get it right.
That said, with experienced schemers such as Yann M'Vila and Mathieu Valbuena in their ranks, you'd back Olympiakos all day long to come through the test.
FC Midtjylland vs Celtic
For all Celtic's strength in the Scottish Premier League, you'd have to say they are not brilliant at qualifying for the Champions League proper.
Last season, Ferencvaros beat them in the qualifying rounds, the year before that it was Cluj, the year before that AEK Athens…
Celtic head to Denmark to face a Midtjylland side who managed to carve out a battling 1-1 draw at Celtic Park in the first leg, so it's a game they are going to have to play on the front foot.
While Celtic undoubtedly have the quality to win the game, where they may come unstuck is fitness.
Midtjylland are ahead of their visitors in terms of preparation and are already a couple of games into the Danish Superliga season. That showed in the first leg too, as they finished the game much the stronger of the two sides.
Had Celtic been travelling to the MCH Arena with something to protect, you'd fancy them to progress. With it all to play for, it's hard to bet against the Danes.
Galatasaray vs PSV
In terms of the tie, this one looks like it's already over.
An Eran Zahavi hat-trick in the first leg helped PSV to a resounding 5-1 win and all-but-guaranteed them a spot in the next round.
Galatasaray will be doubly disappointed given the fact they were still in the tie with just six minutes left. However, two late goals put it out of their reach.
However, Galatasaray are nobody's mugs, and they will be wanting to salvage at least some pride in the return leg in Istanbul.
It's worth remembering that PSV are a little ahead of Galatasaray in terms of fitness given the Eredivisie season starts a week earlier than the Turkish Super Lig.
You would still back Galatasaray to show some kind of response, though, and while it is unlikely to be enough to salvage the tie, it would help them save face in front of their notoriously demanding supporters.
Sparta Prague vs Rapid Vienna
Perhaps the most intriguing match in Wednesday's Champions League qualifiers is taking place in the Czech Republic, where Sparta Prague host Rapid Vienna.
Both teams have already started their domestic campaigns, so neither should have an advantage in terms of fitness, and the tie is delicately poised after Vienna's 2-1 win in the first leg.
While Vienna have that slender lead, their Austrian Bundesliga season opener on Saturday did not go well, with them soundly beaten 2-0 at home by Hartberg.
That is unlikely to have done their confidence much good. In contrast, Sparta Prague won their first Czech Liga match of the season and go into this game without having to travel.
They seem a nice bet to overturn that first leg defeat to us.