Baz will have his contract selected by the Rays to start Monday against the Blue Jays, Marc Topkin of the Tampa Bay Times reports.
The 22-year-old originally lined up to make his MLB debut Friday before being scratched due to back spasms, but he'll end up being pushed back by only a few days. Baz, Tampa Bay's top pitching prospect, posted a 1.76 ERA, 0.85 WHIP and 64:11 K:BB over 46 innings at Triple-A after opening the season at the Double-A level.