The Pioneers battled back to win the first game, as they trailed throughout.
Andrew Roxas and David Nardoni played well for the Pioneers.
Burroughs 10, Arcadia 1: The Indians clinched a share of their third straight Pacific League championship with an easy win Tuesday on the road.
Burroughs (22-3, 12-1 in league) can secure the title outright with a win Thursday against second-place Burbank at McCambridge Park.
Pitcher Haley Schulman had a perfect game going through 5 1/3 innings. She ended up with a complete-game two-hitter, striking out 10.
The Indians jumped out to a 4-0 lead in the first inning on home runs by Schulman and Davina Del Castillo.
"It's nice because we were able to secure at least a tie for the league title with the win [Tuesday]," Burroughs Coach Doug Nicol said.
Burbank 10, Hoover 3: The Bulldogs put themselves in the position to vie for a share of their first Pacific League championship in 25 years with the win Tuesday at Hoover.
Burbank (20-5, 11-2) is in second place in league, one game behind first-place Burroughs. The Bulldogs can claim a share of their first league crown since 1987 with a victory against the Indians Thursday at McCambridge Park.
The Bulldogs collected 15 hits against the Tornadoes.
Burroughs 4, Kennedy 3: The Indians scored two runs in the bottom of the seventh inning to earn the win Monday in a Valley Classic game at Birmingham High.
With Burroughs down, 3-2, going into the seventh, Brice Edrington led off with a walk. She then stole second base. Sidney Ortega followed with a single to center field that scored Edrington to tie the score at 3. Freshman Michelle Santiago then came up and hit a shot over the right-fielders head, scoring Ortega.
Burroughs had a 1-0 lead in the first inning and increased its advantage to 2-0 with a run in the fourth. However, Kennedy pushed across three runs in the sixth to take a one-run lead.
Along with Santiago, Ortega, Shannon Trujillo and Haley Schulman also drove in runs for the Indians.