Horwitz is starting at second base and batting second for Saturday's game against Oakland.
Horwitz was recalled by Toronto on Friday and is now set to make his first big-league appearance of 2024. He was slashing .335/.456/514 with four home runs, 38 RBI and 44 walks over 259 plate appearances in Triple-A before his promotion. Horwitz appeared in 15 games for the big club in 2023, slashing .256/.341/.385 with one home run and seven RBI over 44 plate appearances. The 26-year-old will face off against Athletics right-hander Luis Medina on Saturday.