ORLANDO, Fla. — All winter, slugger Pete Alonso seemed like a perfect fit to join the Red Sox lineup. Instead, he’s joining a motivated American League East rival on a big contract.

Alonso is in agreement on a five-year, $155 million contract with the Orioles, as first reported by ESPN’s Jeff Passan . The move comes one day after fellow free agent slugger Kyle Schwarber signed a five-year, $150 million contract with the Phillies. Alonso’s deal includes no opt-outs and no deferrals, according to a source with knowledge of the agreement.

The Red Sox are believed to have made a formal offer to Alonso, who drove from his Tampa home to meet with interested teams at the Waldorf Astoria Orlando this week. It’s unclear how close Boston was in its pursuit. At the outset of the offseason, at lea

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