The Pittsburgh Pirates have had a lot of promotions in the minor leagues this season, most of them recently. After watching Mitch Keller's Double-A debut last night, I wanted to look at the players on our mid-season top 50 prospects list and see how they are doing with their new clubs. I'll start at the top of the list, with the number next to each player representing their rank on our updated top 50.

1. Mitch Keller - Just promoted from Bradenton this past week, Keller allowed two runs over six innings in his Altoona debut. He was strong through four innings, before working his way through a lot of hard contact in the fifth and some wildness in the sixth.

4. Cole Tucker - Tucker beat his former roommate to Altoona by about two weeks. In 14 games, he is hitting .203/.277/.203. He sto...

To celebrate the upcoming MLB draft, we’re offering a big subscription discount of 18% off from now through the draft , so that you can follow all of our updates and coverage.To get the discount, use the code MLBDRAFT for an Annual subscription, or MLBDRAFT3 for a Top Prospect Plan.

To continue reading the rest of this article, subscribe to Pirates Prospects. Subscribers get access to every article on the site, along with all of our exclusive live coverage of the Pirates' minor league system, all for a very low monthly or yearly rate.

If you're already a member, you can log in below. If you think you're receiving this message in error, please e-mail tim@piratesprospects.com.