Usage patterns
〈事〉の序盤で〈動詞〉to do something in the early stages of an event
We took the lead in the early stages of the match.
序盤を制するto dominate the opening phase
The team that dominated the early stage went on to win.
序盤から〈動詞〉to do something right from the early stages
We attacked aggressively right from the early stages.
序盤で苦戦するto struggle in the early stages
We struggled early on, but pulled off a comeback in the end.