Key groups

Jordan Spieth headlines Thursday’s Golf Channel coverage alongside Graeme McDowell and Jimmy Walker, who tied for second in last weekend’s Players Championship (1:50 p.m. ET). Defending champion Billy Horschel highlights Friday’s play alongside Sergio Garcia and Ryan Palmer (1:50). Matt Kuchar is out with Satoshi Kodaira and Hideki Matsuyama, who is playing the event for the first time (1:40).