RCMP Const. David Wynn was shot and killed while on duty in Alberta earlier this year. Wynn previously lived in Kentville and New Minas and later served as a paramedic in Bridgewater.
Wynn's mother, Cay Wynn, still lives in Kentville and threw the ceremonial first pitch on Friday night.
"She came down happy as can be, and loved it and was excited to throw out the first pitch. She did great," said RCMP Const. Nick MacLean, a tournament organizer.
"She was really appreciative of it, the support with the community and seeing everybody out here last night. She was really happy to see that. She knows Dave would have loved it."
MacLean hopes to raise $20,000 over the weekend.
The money will be set aside for David Wynn's three sons, and also for Aux.Const. Derek Bond, who was shot alongside Wynn but survived.
There are 23 teams and close to 300 people attending the tournament at the Kentville Memorial Park. The silent auction continues until 8 p.m. Saturday, and the ball games will continue Sunday.
Some of the silent auction items include autographed souvenirs from Bret "The Hitman" Hart, José Bautista of the Toronto Blue Jays, former NHL goalie Martin Brodeur and Don Cherry.
This is the second year of the Fallen Heroes tournament. The original tournament in 2014 was organized in honour of the three RCMP officers who were shot in the line of duty in Moncton in 2014.