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Honestly I feel comfortable starting and relieving. I've done both a lot. I really don't have a preference except which one gets me to the big leagues and allows me to excel the most.

"Tyler Thornburg Interview: Talking Pitching, Goals, and Ryan Braun with the Brewers Prospect". Interview with Curt Hogg, reviewingthebrew.com.
Honestly I feel comfortable starting and relieving. I've done both a lot. I really don't have a preference except which one gets me to the big leagues and allows me to excel the most.