Michael Slagowski of Rocky Mountain High School (ID) became the ninth prep runner to dip below the four-minute mark in the mile today. He ran 3:59.53 at the Nike Jesuit Relays in Portland, Oregon.Slagowski, who ran a solo 1:48.70 800m earlier this year, formerly owned a 4:05.71 personal best for the mile. His performance today marked the fourth sub-four-minute mile run by a prep in the past calendar year.3:53.43 Alan Webb (2001)3:55.3h Jim Ryun (1965)3:57.81 Drew Hunter (2016)3:59.38 Matthew Maton (2015)3:59.38 Grant Fisher (2015)3:59.4h Tim Danielson (1966)3:59.71 Lukas Verzbicas (2011)3:59.8h Marty Liquori (1967)