The $100,000 ticket was sold on Sunday, April 28, at Convenience Plus at 99 School Street in Watertown.
The name of the winner was not released. The store will receive a $1,000 bonus.
The player won by correctly guessing all five numbers in the daily "Mass Cash" drawing.
The winning numbers were: 13, 15, 19, 25, 33.
They were one of 111 people who won $650 or more in the state lottery on Sunday.
Click here to see a list of the winners.
Click here to follow Daily Voice Quincy and receive free news updates.