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The Orioles are down to two catchers on their active roster.

Anthony Bemboom was designated for assignment this morning, and the Orioles selected Ryan O’Hearn’s contract from Triple-A Norfolk.

O’Hearn, who is wearing No. 32, gives the Orioles a backup first baseman and corner outfielder. He’s another left-handed bat with the club facing at least four consecutive right-handed starters.

O’Hearn was batting .300/.349/.725 (12-for-40) with three doubles, a triple, four home runs, 11 RBIs, three walks and 13 strikeouts in 43 plate appearances with Norfolk. He was lumped in the last roster cuts in spring training after slashing .375/.444/.650 with two doubles and three home runs in 18 games.

Today’s move puts O’Hearn back on the 40-man roster. The Orioles acquired him from the Royals on Jan. 3 for cash considerations and designated him for assignment two days later while claiming Lewin Díaz off waivers.

Cole Irvin faces his former team today. The Orioles acquired the left-hander in a Jan. 26 trade.

Irvin is 0-2 with a 9.35 ERA and 2.077 WHIP in two starts. He’s totaled 8 2/3 innings and allowed nine runs and 12 hits with six walks and nine strikeouts.

The Orioles finally face a right-handed starter, Adam Oller, who’s been used twice in relief this season and allowed five earned runs (six total) and eight hits with five walks and six strikeouts in 9 2/3 innings.

Oller made 14 starts among his 19 appearances last summer and finished with a 6.30 ERA and 1.628 WHIP in 74 1/3 innings. One of his starts came against the Orioles, when he surrendered six runs and eight hits in five innings at Camden Yards.

Ryan Mountcastle homered twice, and Anthony Santander and Cedric Mullins each hit one.

Oakland snapped a six-game losing streak last night and will try for the series split.

For the Orioles
Cedric Mullins CF
Adley Rutschman C
Ryan Mountcastle DH
Gunnar Henderson 3B
Austin Hays LF
Adam Frazier 2B
Terrin Vavra RF
Ryan O’Hearn 1B
Jorge Mateo SS

Cole Irvin LHP

For the Athletics
Esteury Ruiz CF
Ramón Laureano RF
Brent Rooker LF
Jesús Aguilar 1B
Aledmys Díaz 3B
Kevin Smith SS
Carlos Pérez DH
Shea Langeliers C
Nick Allen 2B

Adam Oller RHP