A string of close games against a tough schedule had Harborfields well-prepared for the postseason and it showed Thursday.

Mason Mee scored off Oliver Olschewski’s corner kick in the 47th minute to lead visiting No. 5 Harborfields to a 1-0 victory over No. 4 East Hampton in the quarterfinals of the Suffolk A boys soccer tournament. Harborfields (10-6-1) will face No. 1 Glenn at 1 p.m. Monday in the semifinals.

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“Every game was a battle for us. This wasn’t new to us,” coach D.J. Greening said. “The boys were enthusiastic and wanted to prove they could not only play with some of the best teams in the county, but beat them.”

Thursday marked Harborfields’ ninth match decided by a goal or less this season (5-3-1), and its defense played a major role. The Tornadoes back line of Michael Barefield, Olschewski, Evan Barnes and Spencer Stapleton held East Hampton to four shots on goal, and Carlos Godoy saved them all.

“East Hampton had a lot of skilled players and they put a lot of pressure on us after we scored, but we were able to keep them off the board,” Greening said, adding that Stapleton made a crucial clearance early in the first half and Godoy made “several big saves in the second half.”

Danny Ruiz made five saves for East Hampton (8-4-2).