Ten of those 11 matches are the five championship matches and the five third-place matches for each of the five categories - boys singles, girls singles, boys doubles, girls doubles and mixed doubles.
The other match is a boys doubles semifinal match between Clear Spring's Francesco Scotto di Carlo and Cory Shives and Boonsboro's Eddie McMurtrie and Mike Ryberg. The winners advance to play North Hagerstown's Charlie Brasher and Allen Sandberg in the championship match.
The team of Sarah Dice and Amanda Jenkins from Clear Spring will play in the girls doubles championship match against Blazer teammates Jessie Kissner and Brittany Smetzer.
John League and Hailee Growden from Williamsport will square off in the mixed doubles championship against Keith Welch and Manon Hostmann from Boonsboro.
David Kurz of Smithsburg will battle Eric Campbell of North Hagerstown in the boys singles championship match.
Gretchen Schoeck of North Hagerstown will face Tinuke Adetunji of South Hagerstown in the girls singles championship match.
The top three finishers in each category will advance to the next weekend's regionals in Baker Park at Frederick.
The team of League and Growden has been the Cinderella team of the tournament.
They came in as the No. 8 seed and beat ninth seed Matthew Cosgrove and Ashley Humphrey of South Hagerstown 10-1 in the first round.
They went on to knock off top-seed Derek Reichard and Katie Blickenstaff of Clear Spring 6-2, 6-4 in the quarterfinals.
League and Growden then went through two tiebreakers to get a huge win against fourth-seed Otto Schoeck and Jessica Shuff of North Hagerstown 6-2, 6-7 (7-3), 7-6 (9-7) in the semifinals.
By Colleen Helf/Staff Photographer
Boonsboro's Keith Welch returns a serve.
By Colleen Helf/Staff Photographer
North Hagerstown's Gretchen Schoeck returns a serve against Boonsboro's Erin McMurtrie in girls' singles action.
By Colleen Helf/Staff Photographer
Clear Spring's Sarah Dice, left, and Amanda Jenkins lost just one game in two matches to advance to the girls doubles final in the Washington County Tennis Championships at North Hagerstown on Saturday.