He did only go 3-for-11 in the three April games he played with Triple-A Sacramento. Of course, the three hits were two homers and a triple. However, that looks like a mammoth slump compared to what he's done since.
This past week, Donaldson went 10-for-19 over six games to earn Prospect Player of the Week honors. Two of those hits were homers and he slugged .842 for the week. Combined with his .609 OBP, he posted a staggering 1.451 OPS. Since he's been back down in Triple-A, Donaldson is hitting .500/.568/.974 with five homers and 14 RBIs in 11 games. He's had six multihit games in eight May contests.
A very strong argument could have been made to give the honor to Red Sox outfield prospect Jackie Bradley Jr. Bradley only had 12 official at-bats for the week thanks to six walks and three hit-by-pitches. Still, he managed a .583/.727/1.167 line for a 1.894 OPS in five games.