Blue Hill Country Club’s Mekhala Costello earned medalist honors at the 121st Massachusetts Women’s Amateur Championship.

Canton’s Costello finished the two rounds of stroke play at 4-under after consecutive rounds of 69. She birdied No. 5 and 16 and eagled the 18th at Taconic Golf Club in Williamstown on Tuesday.

The top 32 players advanced to match play, which will begin Wednesday. Costello topped the Smith sisters of Westford for medalist honors.

Morgan Smith was second after rounds of 71-73, while Molly Smith was third after shooting 74-71.

A third Smith, Maddie, also easily qualified for match play. Carys Fennessy of Youth on Course/Mass Golf (72-77) was fourth, and tying for fifth were Allison Paik of The Cape Club of Sharon (73-77-150) and Mackenzie Whitney of Oak Hill CC (75-75-150).

The two match play finalists will play in Friday’s 18-hole final. Taconic is hosting the tournament for the first time.