Brittany Teman singled up the middle to score Alyssa Hernandez in the bottom of the seventh inning yesterday to give No. 2 Oceanside a 6-5 walk-off win over No. 3 Massapequa (14-8) in Game 3 of the Nassau Class AA semifinals. Oceanside (17-6) plays top-seeded MacArthur in the county championship series starting on Thursday at 6 p.m. at Hofstra.

Massapequa's Krista Carcaterra hit a grand slam with two outs in the top of the sixth to even the score at 5. Grace Bandini went 4-for-4 for Oceanside. Taylor Eisel (2-for-4) hit a two-run triple during a four-run second inning that gave Oceanside a 5-1 lead. Sabrina Seeger went 2-for-4 with two RBIs.

MacArthur 6, Mepham 1: Jessica Lombardo hit a three-run homer in the bottom of the first to propel No. 1 MacArthur (21-2) over No. 4 Mepham in the Nassau AA semifinals. Jessica Budrewicz struck out eight in seven innings of one-run ball.

Babylon 8, Hampton Bays 4: Grace Malley's double scored Makayla Kearns in the sixth inning to break a tie at 4 and lead No. 2 Babylon (15-3) over No. 3 Hampton Bays in a Suffolk B semifinal. Babylon will play top-seeded Center Moriches tomorrow at 2 p.m. in the winners bracket.

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BOYS LACROSSEMount Sinai 10, Eastport-South Manor 2: Danny Bullis had four goals and two assists, Griffin McGrath had three goals and two assists and Shane Walker won 11 of 14 faceoffs to lead No. 3 Mount Sinai over No. 7 Eastport-South Manor in a Suffolk B semifinal. Mount Sinai will play No. 5 Sayville in the county final on Wednesday at 8 p.m. at Stony Brook. Babylon 17, Center Moriches 5: Nick Antolini had five goals and five assists to lead No. 1 Babylon (16-1) over No. 4 Center Moriches in a Suffolk C semifinal. Babylon will play Mattituck for the county title on Wednesday at 3 p.m. at Stony Brook.Mattituck/Greenport/Southold 16, Port Jefferson 8: Tim Schmidt had seven goals to lead No. 2 Mattituck/Greenport/Southold (11-2) over No. 3 Port Jefferson in a Suffolk C semifinal.

Syosset 14, Port Washington 7: Alex Concannon and Mac O'Keefe each had four goals to lead No. 2 Syosset (16-1) over No. 3 Port Washington in a Nassau A semifinal. Syosset plays No. 1 Massapequa in the final at Hofstra on Tuesday at 6 p.m.Cold Spring Harbor 11, Seaford 5: Riley Cox had four goals and Colin Burke added two goals and an assist to lead No. 1 Cold Spring Harbor (15-1) over No. 4 Seaford in the Nassau Class C semifinals at Hofstra. CSH plays No. 3 Mineola in the county final at 3:30 p.m. Tuesday at Hofstra.BOYS TENNISHalf Hollow Hills East 5, Huntington 2: Abhinav Srivastava defeated Patrick Lombardi, 6-3, 6-3, in third singles for No. 2 Half Hollow Hills East (15-2) in its quarterfinal win over No. 7 Huntington. Hills East hosts No. 3 Commack at 4 p.m. today.