Guyer will bat leadoff and start in left field Tuesday night against Wei-Yin Chen and the Orioles, MASN's Roch Kubatko reports. Guyer replaces Kevin Kiermaier in the outfield against southpaws, with Desmond Jennings sliding over to center to accommodate the slower of his two outfield mates. While Guyer could be a regular in the leadoff role against lefties, the Rays aren't scheduled to face another one until next Wednesday in Toronto.