Hannahs appeared in eight games for Montreal in 1977, going 1-5 with a 4.86 earned run average over 37 innings of work, all but one of those games as a starter.
His first taste of the Big Leagues was the year before, going 2-0 over three starts, with a bloated 6.75 ERA in 16 innings pitched.
He’d find himself with the pennant winning Los Angeles Dodgers in 1978, appearing in a single game, throwing two innings and getting hit hard, allowing three hits and two earned runs, though he did strikeout five of the six batters he faced.
In 1979, he’d appear in what would turn out to be the last four games of his Major League career, going 0-2 for the Dodgers with a 3.38 ERA over 16 innings pitched, finishing up with a career record of 3-7, along with an ERA of 5,07 over 16 games and 71 innings pitched.
It’s worthy to note that back in 1976, before being called up to Montreal, he had a fantastic Minor League season with the Quebec Metros of the Eastern League, going 20-6 with a 2.39 ERA and five shutouts over 26 starts.
After a couple of Minor League seasons in 1980 and 1981, including a nice 15-9 campaign with the Albuquerque Dukes in ‘80, he called it a playing career.