Celtics co-owner Steve Pagliuca’s bid to secure the Democratic nod for the open U.S. Senate seat came to an apparent end on Tuesday night when Martha Coakley won in a runaway.

Pagliuca and Alan Khazei were neck-and-neck for third behind Coakley and Democratic runner-up Michael Capuano.

On the Republican side, Scott Brown, whose daughter Ayla is a senior on the Boston College women’s basketball team, cruised to victory in his primary.

Coakley will square off against Brown on Jan. 19 to fill the seat held by the late Edward M. Kennedy.