Four of those five teams meet on the pitch Tuesday.
Allderdice hosts USC at Cupples Stadium. The Dragons are 5-1-1 overall and are 3-0-1 in their last four. The Panthers are 4-1-1 but are coming off their only loss of the season, 2-1, to Canon-McMillan.
Also on Tuesday, Mt. Lebanon travels to Peters Township. The Blue Devils are 3-3 overall but have won three of four while the Indians are 4-1 for the season with three straight wins.
Two other big matches set for Tuesday have sole possession of first place at stake.
McGuffey will visit Mt. Pleasant in Section 3-2A. Both the Highlanders and Vikings are a perfect 4-0 in section play thus far.
Seton LaSalle hosts Serra Catholic in an early Section 4-A showdown. The Rebels and Eagles have each won both of their previous section matches.
Serves and sets
Tuesday marks another busy evening of WPIAL girls volleyball section matches.
Six of those matches feature battles for first place or a share of the early section lead.