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Rockies debut top prospect Sean Sullivan vs Athletics

6/13/2026

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Summary

Story summary

Rockies will start left-hander Sean Sullivan in his MLB debut Friday night against Oakland in Las Vegas.
Sullivan, 23, is a 2023 second-round pick, the club’s No. 11 prospect, and not on the 40-man roster.
He posted a 2.94 ERA in Single-A/Double-A last season, with his 2026 Triple-A ERA rising to 5.60.
He gave up seven runs on 12 hits in 4 2/3 innings at the Las Vegas park on May 19.

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Story summary

Rockies will start left-hander Sean Sullivan in his MLB debut Friday night against Oakland in Las Vegas.
Sullivan, 23, is a 2023 second-round pick, the club’s No. 11 prospect, and not on the 40-man roster.
He posted a 2.94 ERA in Single-A/Double-A last season, with his 2026 Triple-A ERA rising to 5.60.
He gave up seven runs on 12 hits in 4 2/3 innings at the Las Vegas park on May 19.