The Schaumburg Boomers dropped a 4-3 decision to the visiting Rockford Aviators on Monday night.
Rockford scored 2 first-inning runs on 4 hits before Schaumburg starter Seth Webster settled down. Webster, named the Frontier League's pitcher of the week Monday, retired 14 in a row and 19 of 20 before the eighth.
The Boomers were able tie the game in the seventh. Justin Vasquez led off with a triple and scored when Tony Delmonico parked his sixth home run of the year over the wall in left.
Rockford scored twice in the eighth, and the Boomers moved the tying run to scoring position in the ninth but could not complete the rally.
Schaumburg (44-31) welcomes the Evansville Otters on Tuesday night in the first of three with one of the East Division contenders. The Boomers have not announced a starter for the opener; Evansville will send RHP Trevor Walch (5-1, 2.63) at 6:30 p.m.