Freshman Stephan Koenigsfest struck first, defeating Bjorn Hoffmann 6-2, 6-3 on court four. 102 Gergely Madarasz followed on court two with a 6-2, 6-4 win over No.
109 Filip Bergevi, and Renan Hanayama extended his win-streak to 11, besting Connor Heap 6-1, 6-4 on court six.
Mc Gowan connected for a leadoff home run in the second inning, his team-leading fourth long ball of the season and Purdue's first at Alexander Field this year.
After Craig Dedelow also homered to right field for IU in the top of the fifth, the Boilermakers trailed 5-1 entering the following frame.
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The Golden Bears then came back with three wins of their own on courts one, three and five to secure the decision and hand the Boilermakers their fourth 4-3 loss this season.
"The difference in today's match was a few points in doubles and three tiebreakers in singles - that's really it," head coach Pawel Gajdzik said.