This is Bielek's third time being called up by the Astros this season. He has a 3.74 ERA in 14 games (13 starts), tossing two quality starts for Houston. He pitched very well in the month of July, recording a 2.63 ERA in five MLB starts.
His recent performances in the minors haven’t exactly warranted a call-up, as he allowed 14 earned runs across his last three starts.
Martinez has gotten rocked lately as well, although it's a little different at the big league level. One terrible outing can spell the end of your major league run, and that's what ultimately happened with Martinez.
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He allowed seven runs in one inning against the Texas Rangers, sending his ERA skyrocketing from 3.86 to 5.31. Overall he has a 5.23 ERA in 35 games out of the bullpen for the Astros.
The Astros have the sixth-best ERA in the MLB and seventh-best reliever ERA, proving to have the depth and reliable arms to be a contender throughout the season. Not every pitcher is going to be an All-Star, but having the Brandon Bielek's of the world can help a team go a long way.
The Astros are a game back of the Rangers for first place in the AL West and hold a one-and-a-half-game lead in the American League wild card race. It remains to be seen whether Houston will use Bielek as a starting pitcher or a reliever.