Atlantic City police were called to the Golden Nugget Hotel and Casino around 8:30 p.m.
A 20-year-old Philadelphia woman told police she had been assaulted by her boyfriend, 27-year-old Herrera, during an argument. She had visible injuries to her neck and arms.
Police arrested Herrera in his hotel room without incident. He was released on a summons with a future court date.
Following news of Herrera's arrest, the MLB placed him on administrative leave.
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