LOUISVILLE, Kentucky – Barbadian trainer Saffie Joseph Jr. tasted success both in the Upper South and the United States southeast on Thursday, as his barns continued to churn out impressive winners in the respective summer meets.The 34-year-old found himself among the cash at Churchill Downs here when his 4-1 chance Rock Along edged the field by a neck to win the US$100 000 race three.And at Gulfstream Park in Florida, 2-1 choice Doc Amster also carved out a narrow victory in the US$47 000 race four, to hand Joseph added success.