Shane Bieber had the lowest ERA in the AL in 2020, with an ERA of 1.63.

who had the best era in the al in 2020
Interpreted as:
Who had the best era with a minimum of 1 IP per team game in the al in 2020?
2020Bieber2020Keuchel2020Bassitt2020Ryu2020Maeda2020Cole2020Carrasco2020Gonzales2020Bundy2020Lynn2020Giolito2020Valdez2020Berrios2020Greinke2020Singer2020Heaney2020Perez2020Civale2020Gibson2020Boyd1.631.992.292.692.702.842.913.103.293.323.483.574.004.034.064.454.504.745.356.71
NAMESEASONTMGERAWLW%GSCGGFSHOSVIPHTBFRERHRBBIBBHBPSOWPWHIPK/9H/9BB/9K/BBERA-FIPFIP-PRAA
Shane BieberShane Bieber2020
CLECLE
121.6381.88912000077.14629715147210112250.8714.205.352.445.81352.064620.7
Dallas KeuchelDallas Keuchel2020
CWSCWS
111.9962.75011000063.1522571514217004201.095.977.392.422.47453.07699.6
Chris BassittChris Bassitt2020
OAKOAK
112.2952.71411000063.0562611816617025521.167.868.002.433.24533.58825.5
Hyun-Jin RyuHyun-Jin Ryu2020
TORTOR
122.6952.71412000067.0602752220617017211.159.678.062.284.24613.006810.7
Kenta MaedaKenta Maeda2020
MINMIN
112.7061.85711000066.2402482020910008000.7510.805.401.358.00602.996611.3
Gerrit ColeGerrit Cole2020
NYYNYY
122.8473.70012201073.05328827231417029420.9611.596.532.105.53633.88845.9
Carlos CarrascoCarlos Carrasco2020
CLECLE
122.9134.42912000068.0552802222827028261.2110.857.283.573.04633.58806.8
Marco GonzalesMarco Gonzales2020
SEASEA
113.1072.77811100069.259277272487046400.958.277.620.909.14743.31768.2
Dylan BundyDylan Bundy2020
LAALAA
113.2963.66711100065.2512672724517147221.049.876.992.334.24772.946710.7
Lance LynnLance Lynn2020
TEXTEX
133.3263.66713100084.06434434311325068921.069.546.862.683.56704.18914.1
Lucas GiolitoLucas Giolito2020
CWSCWS
123.4843.57112101072.1472883128828029731.0412.075.853.483.46803.187210.1
Framber ValdezFramber Valdez2020
HOUHOU
113.5753.62510000070.2632883228516057661.129.688.022.044.75842.846512.3
Jose BerriosJose Berrios2020
MINMIN
124.0054.55612000063.0572712828826036851.329.718.143.712.62894.06903.3
Zack GreinkeZack Greinke2020
HOUHOU
124.0333.50012000067.067273303069016731.139.009.001.217.44952.796412
Brady SingerBrady Singer2020
KCRKCR
124.0645.44412000064.1522632929823026151.178.537.273.222.65914.07932
Andrew HeaneyAndrew Heaney2020
LAALAA
124.4543.57112000066.2632793533919127021.239.458.512.573.681043.78864.6
Martin PerezMartin Perez2020
BOSBOS
124.5035.37512000062.0552623331828034621.346.687.984.061.64974.88111-3.4
Aaron CivaleAaron Civale2020
CLECLE
124.7446.40012100074.08231239391116036901.328.399.971.954.311034.02903.8
Kyle GibsonKyle Gibson2020
TEXTEX
125.3526.25012101067.17330144401230165811.537.759.764.011.931125.38116-5.4
Matthew BoydMatthew Boyd2020
DETDET
126.7137.30012100060.16727146451522056051.488.959.993.282.731525.77129-8.5