There is also other extenuating factors to consider such as umpires who are having a rough game calling balls and strikes, and the seemingly random luck related factors that can directly contribute to extra runs being scored. Bassit was f***ed over hard by the home plate umpire in last night's game for instance, and instead of being out of the inning with zero runs scored allowed a grand slam later in the inning. Garcia for instance made a great pitch in the 9th last night that led to a weak grounder to second, but it was so softly hit that the runner was able to advance to second, scoring on a base hit later on. A little harder hit ball may have led to a force out or even a double play and then the game ends before extra innings.
The manager putting his relievers in a position to succeed matters a lot as well. Using Bass in a leverage situation against a left handed batter late in the game despite his struggles instead of Mayza, who's only use is retiring left handed batters was asking for trouble.