Already a smashing success story as a former claim turned multiple graded stakes winner, Michael Hui's Zulu Alpha (Street Cry {Ire}) enjoyed a dream run along the rail to earn his first top-level score in the GI Pegasus World Cup Turf Invitational S. last out, and the hard-knocking gelding is right back in the entry box as he attempts to defend his title in the 1 3/8-mile GII Mac Diarmida S. Saturday at Gulfstream. Haltered for $80,000 out of a dominant optional-claiming victory in the summer of 2018 at Churchill,...