2009 was his most successful season, being named the team captain for the NPSL Final Four Tournament (as Juan Fiz was injured), winning another Midwest Region title, earning a name on the Midwest All-Star team, and making many key saves in the Final Four Semi-Final, but eventually losing to Sonoma County Sol 4–1.
County Durham | Orange County | County Cork | St. Louis County, Minnesota | County Galway | County Mayo | county | Montgomery County | Los Angeles County Museum of Art | Lancashire County Cricket Club | Westchester County, New York | Nassau County, New York | County Antrim | Rockland County, New York | County Down | Washington County | Hillsborough County | Derby County F.C. | County Meath | County Donegal | Erie County, New York | County Tyrone | County Tipperary | County Louth | County Armagh | Wayne County, Michigan | Somerset County Cricket Club | Los Angeles County | Sol LeWitt | Jefferson County |
The 2010 Cup will feature 8 teams from the MLS, 9 from the USSF Division 2 (being all 9 US-based teams), all 6 teams from the USL Second Division, 8 teams from the PDL, 8 from USASA, and an additional team resulting from a single match between Sonoma County Sol of the National Premier Soccer League and PSA Los Gatos Storm of US Club Soccer.
Doxa entered the Lamar Hunt U.S. Open Cup for the first time in 2009, and narrowly missed out on qualifying for the tournament proper at the first attempt, finishing second to National Premier Soccer League side Sonoma County Sol on goal difference.
During his college years Kronberg also played for Sonoma County Sol in the National Premier Soccer League.