The starter left after five innings with a one run lead. (Actually, he was "pulled" after letting the first two batters on base in the sixth.) A reliever comes on, "strands" the two inherited runners in the sixth, then pitches the seventh and the eighth, that is a total of three innings. From what I understand, pitching three innings is one way to earn a save.
A closer pitches the ninth. And neither side scored after the starter left so the lead remained at one run.
Does the closer automatically get the save? Or might the three inning pitcher get the credit since he stranded two inherited runners? And it isn't possible for both of them to get the save, is it, even though both "qualify?"