For example, Germany losing to Japan, Argentina losing to Saudi Arabia and recently, France losing to Tunisia.
My question is, will we have a lot of unpredictable games during this World Cup in the future?
I think Germany and Japan will end up so close in the group that we'll have to check the tie breaker rules for this tournament.
From one source I can see there's no head-to-head comparison (Where Japan won against Germany):
Superior goal difference resulting from the group matches between the team concerned
Greatest number of goals scored in all matches between the teams concerned
Highest team conduct score – team conduct score is based on the number of yellow and red cards a team has obtained. The team with the highest team conduct score will receive the higher ranking.
Yellow Card: Minus one point
Indirect Red Card (acquired via two yellow cards): Minus three points
Direct Red Card: Minus four points
Yellow Card and Direct Red Card: Minus five points
But this other source says head-to-head does count, just before the fair play score:
Step 2 - Goal Difference
Step three - Goals scored
Step four - Head-to-head record
Step five - Fair play record
Step six - Random draw
In any case, if Germany wins by a lot of goals and Japan draws, they can end up going to the next round, but if they tie on that number, then it's not that clear to me what's the next rule to apply.
What exactly makes you think that they will end up "so close"? There is only a single scenario that would lead to Japan and Germany ending up "so close":
Japan vs. Spain ends in a draw and Germany wins by 1 goal against Costa Rica.
1. Japan vs. Spain 1-1 and Germany Costa Rica 1-0.
2. Japan vs. Spain 2-2 and Germany Costa Rica 2-1.
3. Japan vs. Spain 3-3 and Germany Costa Rica 3-2.
I think we can leave 3. away. I also think we can leave 2. away because I don't see the game between Japan and Spain end 2-2. There is one situation that might make sense and that is 1. Let's see what the odds for a combination bet would be. I pull the data from bet365:
Germany vs. Costa Rica 1-0 - 12.0
Japan vs. Spain 1-1 - 9.5
For your outcome to occur, we are talking about conditional probability, meaning that we multiply the two odds provided above: 12.0 x 9.5 = 114.0
The probability for your "so close" case to occur is 0.877%. To be fair though a 2-2 between Japan and Spain is not impossible. In conditional probability calculations, you add up different possible outcomes. Since the odds for Japan to tie 2-2 vs. Spain is half of 1-1, and Germany vs. Costa Rica 2-1 is roughly the same (a bit less), you could add about 50% of the probability for outcome 1. to outcome 1., giving your roughly 1.3%. Scenario 3. is statistically negligible.
That means statistically in 1 out of 77 times (based on bet365 odds) the scenario you think we are very close to is going to happen.