The Rockies’ reeling rotation is in motion as the season winds down.

Veteran right-hander Antonio Senzatela, who’s been hit hard, was moved to the bullpen on Tuesday. Fellow right-hander German Marquez, on the injured list since July 21 with biceps tendinitis, is scheduled to return and start against the Cubs on Friday night at Coors Field.

Senzatela’s demotion is not a surprise. The 30-year-old is 4-15 with a 7.15 ERA in 24 games (starts), and batters are hitting .356 against him. Last week, the Rockies released struggling veteran left-hander Austin Gomber. The Rockies cleared space by cutting Gomber and demoting Senzatela, because they want to see what rookie right-handers McCade Brown and Tanner Gordon can do during the final month of the season.

“Needless to say, ‘Senza’ has not had

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