State Police report a woman walking by the lagoon around 2:50 a.m. was pushed to the ground by a man, who was then chased off by several passersby.
She was taken to Mass. General for treatment of minor injuries.
The man is described as white or Hispanic, bald, about 5'7" or 5'8" tall.
The suspect in a still unsolved series of attacks along the Esplanade and in South Boston's Moakley Park between 2006 and 2009 was described as black and 5'8" to 5'10." A suspect in a 2012 attack was also black, as was the suspect in a 2011 attack.
Anyone with information about this incident or the assailant can call State Police at 617-727-6780.