Six Ninety One (Congrats) assertively stalked outside then pounced on the pacemaker entering the far turn to win his ninth race of the year Tuesday at Arizona Downs. The victory augmented the 9-year-old gelding's lead as the winningest horse in North America for 2021. No other Thoroughbred on the continent has won more than six so far this year. The most noteworthy aspect of Six Ninety One's achievement is that he has racked up those nine wins in just the first six months of the season from 12 starts. In...