[DATEBOOK] For the first time since the launch of MLS, two amateur teams are still alive in the fourth round of the U.S. Open Cup. Besides the USASA's Cal FC, which faces MLS's Seattle Sounders, the PDL's Michigan Bucks host the Dayton Dutch Lions on Tuesday. Another minor-league team is assured of reaching the final eight as the NASL's San Antonio Scorpions, riding a nine-game unbeaten streak, host the Charlotte Eagles of USL PRO. For the complete schedule ...

Schedule:
Fourth Round
June 5 in Hershey, Pa.
Harrisburg City Islanders (USL PRO) vs. New York Red Bulls (MLS)
June 5 in Boyds, Md.
D.C. United (MLS) vs. Philadelphia Union (MLS)
June 5 in Pontiac, Mich.
Michigan Bucks (PDL) vs. Dayton Dutch Lions (USL PRO)
June 5 in Kansas City, Kan.
Sporting Kansas City (MLS) vs. Colorado Rapids (MLS)
June 5 in San Antonio, Texas
San Antonio Scorpions (NASL) vs. Charlotte Eagles (USL PRO)
June 5 in Stanford, Calif.
San Jose Earthquakes (MLS) vs. Minnesota Stars (NASL)
June 5 in Cary, N.C.
Carolina RailHawks (NASL) vs. Chivas USA (MLS)
June 5 in Tukwila, Wash.
Seattle Sounders FC (MLS) vs. Cal FC (USASA)