Losing streak

[2] In fact, one study of European association football matches using a Monte Carlo methodology found that once ability was accounted for, a team was actually slightly less likely to win or lose when it had experienced the same result in the previous match.

This means that one has a slightly higher probability of losing the next match because one lost the previous one.

[7] The outcome of a match does not solely depend on the strength of the opponents, but also on how much effort one or the other is willing to invest.

The loser effect rises from the tendency to hold back on the next match after losing.

On the other hand, the winner effect encourages the opponent who won the previous match to invest more in the next fight.