By Mark Lamport-Stokes
AUGUSTA, Georgia, April 5 (Reuters) - Reigning Masters champion and world number two Jordan Spieth has been grouped with fellow American Bryson DeChambeau and England's Paul Casey for Thursday's first round at Augusta National.
Spieth, a double major winner who stormed to a stunning wire-to-wire victory last year by four shots at the age of 21, will tee off at 9:48 a.m. ET (1348 GMT) with U.S. Amateur champion DeChambeau and Casey.
Australian world number one Jason Day, who landed his first major title at the 2015 PGA Championship, will launch his bid for a second consecutive grand slam crown in the company of American Matt Kuchar and South African Ernie Els.