St. Mary’s High pulled off the first upset of the young field hockey season, upending No. 3 Garrison Forest School in an IAAM A Conference opener in Annapolis Tuesday afternoon.

Senior Kaela Jarvis and sophomore Stephanie Lazo had a goal and an assist for the Saints (2-0 overall, 1-0 IAAM A), and Kristen Lamon, Jamie Ruland and Caitlin Crouse added a score. Senior Kaeli Smith provided an assist.

Brooke Adler, Cody Magness and Erica Marshall each scored for Garrison Forest, which reached the IAAM A Conference finals last season. Candice Fisher made 10 saves in goal for the Grizzlies (1-1, 0-1).

Annie Galligan stopped 12 shot for the Saints, and Mary Mulhern made six saves. St. Mary’s head to Archbishop Spalding Thursday afternoon for a league contest.

Garrison Forest looks to bounce back with a home league match with No. 10 Notre Dame Prep Thursday. Saturday, the Grizzlies host their invitational tournament featuring No. 18 Mount Hebron, Winters Mill and Mount de Sales Academy.

St. Mary’s 5, Garrison Forest School 3

Goals: Garrison Forest-Adler, Magness, Marshal; St. Mary’s-Lazo, Lamon, Ruland, Crouse, Jarvis.
Assists: St. Mary’s-Jarvis, Smith, Lazo.
Saves: Garrison Forest-Fisher 10; St. Mary’s-Mulhern 6, Galligan 12.