Jankowski was sent back to Triple-A Fresno after recording his first major-league win Monday, Brian McTaggart of MLB.com reports.
Jankowski was optioned after allowing four runs on five hits (two homers) over 2.1 innings. He now owns a 16.20 ERA and 2.40 WHIP across 3.1 big-league frames in two games this season. A corresponding roster move will be announced prior to Tuesday's game.