Emmett Mortell has the lowest career completion percentage when scoring 5+ passing touchdowns, at 24.9 percent.

lowest completion percentage in a 5 td passing effort
Interpreted as:
lowest completion percentage by a player in a 5 or more td passing effort
MortellBrumbaughGildeaBrockTaliaferroPattersonSacrintyBarnumPaytonBusseyDoehringGirardCagleYouelMcCulloughPresnellTracyGeriGrigasScarbathSmuklerPancieraDudley24.928.128.228.429.431.031.331.732.432.533.734.034.034.234.335.635.836.136.136.236.436.536.5
NAMEGPPCTTDCMPATTYDSAVGYDS/GTD%INTINT%SCKSCKYRATE
Emmett MortellEmmett Mortell3024.99421696553.921.85.3158.924.0
Carl BrumbaughCarl Brumbaugh7028.16341216565.49.45.01411.626.6
Johnny GildeaJohnny Gildea4428.25511819645.321.92.83418.818.9
Lou BrockLou Brock5828.4719675197.78.910.446.069.3
George TaliaferroGeorge Taliaferro6129.46471608435.313.83.8159.422.5
Billy PattersonBilly Patterson1931.06481557564.939.83.91912.321.5
Nick SacrintyNick Sacrinty1131.3515482996.227.210.436.362.8
Len BarnumLen Barnum5231.76381206025.011.65.01512.526.5
Walter PaytonWalter Payton19032.4811343319.71.723.5617.60069.6
Young BusseyYoung Bussey1032.5513403538.835.312.537.574.3
John DoehringJohn Doehring2833.7729866277.322.48.11011.648.1
Jug GirardJug Girard11434.05671971,0175.28.92.5136.632.9
Chris CagleChris Cagle3034.05481417495.325.03.51812.824.8
Jim YouelJim Youel2334.27501468495.836.94.8106.842.3
Hugh McCulloughHugh McCullough3634.36872541,1054.430.72.44116.117.0
Glenn PresnellGlenn Presnell6035.6121103091,6705.427.83.93712.027.6
Tom TracyTom Tracy8935.86246785412.79.69.057.582.8
Joe GeriJoe Geri4836.1131012801,9266.940.14.6279.636.7
John GrigasJohn Grigas4936.16601668895.418.13.62716.327.0
Jack ScarbathJack Scarbath2936.2181012791,8686.764.46.53010.842.1
Dave SmuklerDave Smukler3836.4151123081,3574.435.74.93210.427.4
Don PancieraDon Panciera1436.5535965826.141.65.299.436.0
Bill DudleyBill Dudley9036.56812229854.410.92.7177.728.1
Gary MarangiGary Marangi1936.7121042831,3734.972.34.2217.42518236.1
Roy McKayRoy McKay3536.96381035925.716.95.81110.736.6
StatMuse has season-level data for completion percentage going back to the 1932 season.

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