The Panthers scored the game's opening eight runs in the conference win, using 12 hits and four walks to jump on top of the Mustangs.
Tyler Munden and Andy Drey led the way as both collected two hits, scored two runs and drove in two runs. Austin Demers was 2-for-3, drove in one and scored one, and Kennedy Drey and Ryan Peters drove in one run apiece.
Bobby Ivey was the winner on the mound as he was one out away from a complete game. He gave up five earned on five hits. He walked seven and struck out ten.
Jake Hahn took the loss for Newell-Fonda, allowing nine hits and four walks. He fanned two. Brendan Kelly drove in two for the Mustangs, and Brady Dicks, Ben Hecht, and Rigo Johnson drove in a run apiece.
The second game picked up where the teams left of nearly a month ago, with the Mustangs leading 6-4 heading into the bottom of the sixth inning. St. Mary's answered immediately with three runs as Luke Lenhart drove in one on a groundout, and Ivey brought in two with a double.
A bases loaded walk to Seth Dicks brought Newell-Fonda back level, but another bases loaded walk, this one to Lenhart, gave the Panthers the walkoff win.
Joe Sandhoff got the win on the mound as he pitched one innings, allowing one run on two hits.
"I was really pleased with how we competed," said St. Mary's head coach Ryan Berg. "We jumped out to a nice start in the first game, the conference game. We played hard and withstood several good comebacks from Newell-Fonda. We made the big plays when it counted. I also loved our approach at the plate. We did a nice job of hitting to the opposite field and driving in runners in key situations. We are playing solid baseball right now and still have room to get even better. I like the direction we are headed and hope we can continue to improve and peak at the right time.
St. Mary's improves to 11-6 overall and 6-0 in Twin Lakes play. They have a make-up date with East Sack tonight. Newell-Fonda sits at 6-12 and 4-3.