Christian Pastirik (St. Mary's) scored the game-winner with 8:51 left and Towson's tough defense limited Penn State to one shot in the final eight minutes as the No.20 Tigers beat the visiting Nittany Lions, 10-9, on Saturday at Johnny Unitas Stadium.
Towson's fifth straight win secured the regular-season title and the top seed in the Colonial Athletic Association tournament, which begins May 5.
The Tigers (6-5, 4-0) led 9-6 after Tim Stratton (two goals, two assists) scored with 1:14 left in the third quarter.
The Nittany Lions (2-10, 1-3) scored three straight in the fourth quarter to tie the score at 9 with 8:57 left.
"Our guys just don't quit, and we just hang in there," Towson coach Tony Seaman said. "We played a lot of defense today, and Penn State took a lot of shots on us."
Led by a goal and an assist from Carl Iacona, the Tigers built a 4-1 lead in the first 16 minutes of the game. After the teams traded goals, the Nittany Lions narrowed the lead to 5-4 with back-to-back goals in a two-minute span.
Stevenson 10, Salisbury 6: The visiting Mustangs (16-1) outscored the Sea Gulls (17-1) by 6-2 in the second half and became the champions of the Capital Athletic Conference for the first time in 16 years.
Stevenson had lost the previous two championship games to Salisbury but has won three of their past five meetings, including a win at Sea Gull Stadium last year to end Salisbury's 105-game unbeaten streak against CAC opponents.
Neal Barthelme and Richie Ford each scored twice for the Mustangs. Matt Cannone had a hat trick, and Mike Von Kamecke had three assists for Salisbury.
No. 7 Loyola 17, Hobart 12: The visiting Greyhounds (9-2, 6-0 ECAC) scored four goals in 90 seconds in the third quarter to beat the Statesmen (2-10, 0-6).
Matt Langan had a game-high four goals for Loyola, which outscored Hobart, 11-4, over the second and third quarters.
UMBC 8, Vermont 7, OT: Maxx Davis (Friends) scored an unassisted goal with 1:27 left in overtime to lift the visiting Retrievers (4-7, 3-1 America East) over the Catamounts (3-11, 2-2).
The win clinched a playoff berth for UMBC, its seventh in a row. Davis finished with three goals, and Kyle Wimer and Rob Grimm each had two. Vermont's Drew Phili led all scorers with four.
Mary Heneberry (Dulaney) had four goals for Loyola, which took a four-goal halftime lead and held on in the second half.
Muhlenberg 21, Washington College 14: Amanda McGovern had five goals and five assists to power the visiting Mules (9-6, 4-5 Centennial Conference) past the Shorewomen (8-7, 3-6).
Washington College, led by Mollie Shipley with five goals, took a 2-0 lead 1:38 into the game before Muhlenberg scored 10 of the next 13 goals to take a 10-5 lead with 8:25 left in the first half.
Frostburg State 19, Shepherd 6: Ali Kapustin and Chelsea Feeney each had hat tricks to power the host Bobcats (9-7) past the Rams (2-13).
Frostburg outscored Shepherd 14-3 in the first half.