The Terps topped two ranked opponents — Indiana and Yale — last week.
Bergmann is the first player to earn Big Ten honors on offense and defense since at least 2010.
Seppi also earned the award on Sept. 10.
Goals from Loren Sefcik and Mikayla Dayes completed a crucial second-half comeback.
It was Bergmann's second goal in as many games.
It was Bergmann's parents' first visit to see their son play.
Loren Sefcik got the Terps on the board in the 64th minute, and Dayes sealed the win with a late tally.
All three of the Terps' goals came in a 14-minute span in the first half.
The Terps played the Hoosiers three times in 2018.
Only four of the Terps' attempts were on target.