DataBaseball
2026

Players · surnames beginning O

MLB Players — O

80 players, from Peter O'Brien to Marcell Ozuna. Seasons are the ones published here, not a whole career — a player who debuted earlier begins at the first season in the lake.

Surnames beginning O, alphabetical. Plate appearances for batters, innings for pitchers.
PlayerRoleLast clubSeasonsPAIP
Peter O'BrienBATMIA2015–2019200
Riley O'BrienPSTL2021–2026121.3
Darren O'DayPATL2015–2022230.7
Eric O'FlahertyPATL2015–201777.0
Brian O'GradyBATSD2019–2021114
Chris O'GradyPMIA2017–2018940.0
Ryan O'HearnBATPIT2018–20262,902
Logan O'HoppeBATLAA2022–20261,462
Brian O'KeefeBATSEA2022–202325
Jack O'LoughlinPOAK20249.7
Shawn O'MalleyBATSEA2015–2016289
Tyler O'NeillBATBAL2018–20262,578
Ryan O'RourkePMIN2015–2019148.3
Sean O'SullivanPPHI2015–20162392.3
Trevor OaksPKC201813.7
Bailey OberPMIN2021–20262740.7
Scott ObergPCOL2015–20191257.3
Brett OberholtzerPPHI2015–201610108.7
Bryce Montes de OcaPNYM20223.3
Christian Montes De OcaPAZ20252.7
Joseph OdomBATTB2020–202146
Rougned OdorBATSD2015–20234,007
Jake OdorizziPHOU2015–2022241048.3
Alexi OgandoPCLE2015–201898.3
Cristofer OgandoPTB20224.3
Nefi OgandoPMIA2015–201619.7
Shinnosuke OgasawaraPWSH2025138.7
Seunghwan OhPSTL2016–20192225.7
Pierson OhlPMIN202530.0
Ross OhlendorfPCIN2015–201685.0
Mike OhlmanBATTOR201713
Shohei OhtaniBATLAD2018–20264,925614.3
Kazuma OkamotoBATTOR2026608
Steven OkertPMIA2016–20264369.0
Chris OkeyBATLAA2022–202315
Wyatt OldsPBOS202615.0
Jared OlivaBATSF2020–202666
Edward OlivaresBATPIT2020–2024967
Héctor OliveraBATATL2015–2016108
Adam OllerPMIA2022–2024136.3
Edgar OlmosPSEA201514.0
Matt OlsonBATATL2016–20265,868
Reese OlsonPDET2023–2025284.7
Tyler OlsonPCLE2015–201994.0
Mike OltBATCWS2015102
Jorge OnaBATSD202015
Logan OndrusekPBAL20166.3
Nate OrfBATOAK2018–202032
Paulo OrlandoBATKC2015–2018918
Jonathan OrnelasBATATH2023–202680
Tirso OrnelasBATSD202516
Kaleb OrtPHOU2021–2025122.3
Oliver OrtegaPMIN2021–202358.0
Rafael OrtegaBATCWS2016–20241,295
Abimelec OrtizBATWSH2026127
Danny OrtizBATPIT201713
David OrtizBATBOS2015–20161,240
Joey OrtizBATMIL2023–20261,450
Luis OrtizPPHI2018–202434.0
Luis OrtizPCLE2022–2025327.0
Eric OrzePMIN2024–202684.7
Josh OsichPCWS2015–20214220.7
Alejandro OsunaBATTEX2025–2026397
José OsunaBATPIT2017–20207052.3
Roberto OsunaPHOU2015–2020315.0
Corey OswaltPNYM2018–20212494.7
Michel OtañezPATH2024–202539.3
Dan OteroPCLE2015–2019265.7
Adam OttavinoPNYY2015–2025500.0
Glenn Otto Jr.PTEX2021–2023169.7
James OutmanBATDET2022–20261,057
Connor OvertonPPIT2021–2023159.3
Dillon OvertonPSD2016–2017147.3
Johan OviedoPSTL2020–202622364.7
Luis OviedoPPIT202129.7
Hunter OwenBATPIT20215
Henry OwensPBOS2015–2016285.0
Tyler OwensPDET20253.0
Chris OwingsBATPIT2015–20232,0963.7
Marcell OzunaBATPIT2015–20266,092
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