Jax will serve as the Rays' opening pitcher in Friday's game against the Guardians, Marc Topkin of the Tampa Bay Times reports.
Jax has worked primarily in high-leverage spots all season, and that has continued since he joined the Rays at the trade deadline. However, he's struggled to a 7.20 ERA and 1.80 WHIP across 10 innings with Tampa Bay, so working as an opener could prove to be a bit of a reset for the right-hander. Jax will likely only work an inning or two before giving way to Ian Seymour, who is expected to work in bulk relief.