Mark Casse may have made more starts over dirt and synthetic surfaces combined than any other trainer in history-over 5,000 starts on synthetic and 5,000 on dirt in the past 15 years alone. He estimates that he has sent horses out to gallop, breeze, or race over a synthetic surface 150,000 times in the past 10 years. With a base at Woodbine, where they race and train over a Tapeta surface which sports one of the lowest instances of catastrophic injuries in North America, Casse offered to sit down with...