The Seattle Mariners are promoting top prospect Colt Emerson, a 20-year-old infielder, to make his major league debut against the Padres as they cope with injuries, including the loss of leadoff man Brendan Donovan. Emerson, the No. 6-ranked prospect in MLB and the youngest Mariner debut since Félix Hernández, recently signed a record eight-year, $95 million contract. He will start at third base, replacing Leo Rivas, as the team seeks to improve its 22-25 record. The Mariners hope Emerson can replicate the success of fellow young infielder Cole Young, who has contributed significantly since his debut last year.
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