PBA50 Tour rookie Rolando Sebelen of the Dominican Republic jumped out to a 77-pin lead after Friday’s  first round of the PBA50 Cup presented by DV8 Friday at Spectrum Lanes in Wyoming, Michigan. Sebelen, a multi-medalist in international competition, totaled 1,857 (232.12 average) on games of 248, 248, 264, 214, 191, 227, 231 and 234 on the PBA Earl Anthony 42 lane pattern, with PBA Tour champion Brian Kretzer second at 1,780.  “I’m feeling great and my physical...