Video of Thyago Vieira throwing his first bullpen session of spring training.

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PEORIA, Ariz. — Thyago Vieira stepped on a mound for the first time this spring and most of the Mariners front office and coaching staff watched intently as the flame-throwing right-hander threw his bullpen session on Friday.

Vieira has a fastball that has touched 103 mph and could be the next hard-throwing reliever to make the jump from Class AA to the big leagues.

Here’s theĀ backstory on how Vieira went from almost being released to being added to the 40-man roster and invited to big league spring training in one year.

Asked about Vieira’s bullpen, pitching coach Mel Stottlemyre said: “I was very, very impressed.”

This last pitch of the bullpen session just hissed out of his hand.