Main-sequence MESA stellar evolution models of a rapidly rotating (v sin i = 550 km s⁻¹) 50 M_⊙ star for a range of metallicities. The Galactic and LMC models show traditional redward evolution, while the SMC and even lower-Z (one-tenth solar) models start to show blueward chemical homogeneous evolution. The models employ Vink et al. (2000, 2001) mass-loss rates and assume a moderate amount of core overshooting, with a value of α_ov of 0.335, similar to the Brott et al. (2011) models.