"I felt like we played well up to that point," Mager added. "But then the wheels came off."
The ninth-inning rally by Brown spoiled an earlier comeback by Harvard, who fought back after falling behind 1-0 in the fourth inning.
"It was tough to lose, especially since we've been struggling lately," Mager said. "To come back after being down only to give up the lead was disheartening."
Harvard's first run came in the bottom of the sixth when a sacrifice fly by Mager drove home junior Joe Llanes, who had led off the inning with a double.
The Crimson then added two more runs in the eighth, as Lentz struck a two-run single up the middle.
Harvard was held scoreless the rest of the way, however, as Brown junior Jim Johnson (5-2) went the distance to earn the win.
The nine-inning effort was Johnson's sixth complete game of the season.
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