Jake McGee, like Bryan Shaw, was a free agent signee for the Rockies last season (McGee resigned, though). Like Shaw, McGee struggled as he had an ERA of 6.49 in 61 games.
His struggles have continued in Spring Training as he has an ERA of 9.00 in five games thus far. In five innings, he has a WHIP of 1.60 and he has allowed seven hits, five runs (all earned), and he has an opponent batting average of .350.
Shaw and McGee were the guys you probably thought of on this list but there are three others that have not seen the results that they would like this season and one of them is in the starting rotation.
After ending the regular season on a good note (3.25 ERA, .243/.295/.398 opponent slash in September) and pitching well in the postseason (6 innings, four hits, one run, two walks in Game 2 of the NLDS), Tyler Anderson has not pitched well in Spring Training thus far.
He is 0-2 with a 7.88 ERA in three games (one start). He has pitched in 8 innings and he has allowed 11 hits, seven runs (all earned), and three walks. His opponents are hitting .324 against him and he has a 1.75 WHIP.
Anderson is the only member of the rotation that is a part of this list but there is another player who could potentially be a starter down the road that has not had a spring training to remember.