He ran a 37.73 at the Eastern Relays on Saturday .
Bryan Station 's Isaiah McCall ran the 300 - meter hurdles in 37.48 seconds , topping his previous best time by . 25 .
Isaiah McCall ran a 37.73 at the Eastern Relays on Saturday .
Bryan Station 's Isaiah McCall ran the 300 - meter hurdles in 37.48 seconds , topping his previous best time by . 25 .