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The Rockies have replaced Tulowitzki on the active roster with prospect Chris Nelson. Nelson has played well at Colorado Springs batting .311 with five home runs and 20 RBIs but Clint Barmes is expected to get most of the starts at shortstop with Melvin Mora and Jonathan Herrera competing with Nelson for playing time at second base. I suggest picking up Nelson in NL-only leagues. He many not receive many at-bats but he has the highest ceiling of the trio.