Orioles designate veteran infielder for assignment

The Baltimore Orioles have designated infielder Emmanuel Rivera for assignment and reinstated Jordan Westburg from the 10-day injured list, per a team announcement. Baltimore also optioned lefty Grant Wolfram to Triple-A Norfolk, clearing a spot for the activation of lefty Jose Castillo, whom the O’s claimed off waivers Monday.

Rivera, 29, came to the Orioles following a DFA in Miami last summer. He erupted for a .313/.370/.578 slash and four homers in 73 plate appearances down the stretch, prompting the O’s to tender him a $1M contract in the offseason. He hasn’t replicated that output in 2025, however. Through 127 turns at the plate, Rivera has logged a tepid .250/.291/.283 slash that more closely resembles his career .245/.305/.360 output in 1169 plate appearances.

He’s still a quality defender at third base and has added some experience at first base, but Rivera is out of minor league options and thus couldn’t simply be sent to the minors without first being removed from the 40-man roster by way of a DFA. He’ll now be made available to the game’s 29 other teams via outright waivers. If and when he clears, Rivera would have the right to reject a minor league assignment in favor of free agency (both by virtue of having more than three years of MLB service and a prior outright in his career).

It’s been a stop-and-start year for the 26-year-old Westburg. He’s been highly productive when healthy enough to take the field but has endured lengthy IL stints owing to both a hamstring strain and a right ankle sprain. He’s just now returning from the latter of those two maladies after spending nearly a month on the shelf.

When he’s been able to take the field, Westburg has popped 25 extra-base hits (15 homers, nine doubles, one triple) and recorded a stout .276/.326/.473 batting line while splitting his time between third base and second base. Dating back to last season, Westburg has belted 33 home runs in just 751 plate appearances — despite being a right-handed hitter in a ballpark that overwhelmingly sapped right-handed power in 2024 (before altering their left field dimensions this past offseason).

Westburg is controllable for another four seasons in Baltimore and won’t be eligible for arbitration until after the 2026 season. He’s been limited to just 73 games this season, but he’s demonstrated potential 30-homer pop if he can remain healthy for a full year. He’ll enter the offseason lined up as the Orioles’ starter at third base, joining shortstop Gunnar Henderson and second baseman Jackson Holliday as locks in the infield at Camden Yards.

Former top prospect Coby Mayo is currently getting plenty of run at first base but has yet to solidify himself as a credible hitter at the MLB level. Samuel Basallo, another touted prospect (whom the Orioles recently extended), will also be in the mix for reps at first base. Longtime O’s slugger Ryan Mountcastle is also still in the picture, but he’s slumping badly to close out a down year overall and will be owed a raise on this year’s $6.78M salary ahead of his final season of club control, making him a non-tender or trade candidate.