Sells had a nice first taste of the Majors, going 2-0 with a 2.81 earned run average over 10 appearances and 16 innings of work.
He’d go 7-2 in 1973 with a 3.71 ERA over 51 appearances, including 10 saves over 68 innings pitched, all which would end up being career highs.
He would pitch another two seasons in the Big Leagues, going a combined 2-5 with both the Angels and five games with the Los Angeles Dodgers in 1975, which would end up being the last of his career.
All told he finished his time in the Majors with a record of 11-7, posting an ERA of 3.90 over 90 appearances and 138.1 innings pitched, with 12 saves.