Schaumburg has won six games in a row to equal a franchise record set earlier this season.
Phelan (4-1) allowed just 2 hits. Following a two-out single in the third, the Frontier League all-star retired 16 in a row before the leadoff man reached in the ninth and eventually scored the lone run.
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The Boomers provided Phelan with plenty of support in the third inning, sending 10 men to the plate and scoring 4 runs.
Schaumburg took advantage of wildness from Joliet starter Corey Kimes, drawing 4 walks in the inning. Michael Valadez drew a bases-loaded walk to force home the first run and Jordan Dean added a 2-run single.
Schaumburg added 4 more in the fifth and the rout was on.
Dean finished with 4 RBI and four players posted 2 hits.
The Boomers (38-28) return home today for a three-game series with Rockford.