by Jessica Martini & Christina Bossinakis LEXINGTON, Ky - With a pair of seven-figure colts by Nyquist leading the way, trade remained strong straight through the conclusion of Book 2 during the fourth session of the Keeneland September Yearling Sale Thursday in Lexington. "It was a great day," said Keeneland Vice President of Sales Tony Lacy at the close of business Thursday evening. "We are very pleased. The median is up 25% for the session over last year, which is a metric that we always use. That shows that it...