My top pick in last Saturday’s Kentucky Derby was Nehro, who finished second. But I was even happier to watch 23-1 longshot Animal Kingdom win the race, returning a nice $329.80 exacta. I was even more thrilled when Mucho Macho Man finished third, giving those who played the trifecta $3,952.40. Not a bad afternoon.Derby 137 at Churchill Downs in Louisville attracted the most fans ever with 164,858 people, nearly 1,100 more than the previous record set in 1974.