Wednesday's starter for the Orioles will be either Jason Hammel or Freddy Garcia, Showalter said. The off day Monday would allow Hammel to stay on regular rest. … RHP Zach Clark did not fare well in his first game as a knuckleballer at Double-A Bowie. He allowed six runs (five earned) on four hits, six walks and a hit batter. He threw 105 pitches (50 strikes) in just 3 1/3 innings. … Minor league first baseman Christian Walker, who was the organization's player of the month in April, has been promoted from Low-A Delmarva to High-A Frederick. … INF Nick Delmonico has been reinstated from the disabled list at Frederick.