In 1988, Day turned professional. Day won the 1999
MCI Classic defeating
Payne Stewart in a playoff. It was his 154th PGA Tour start and his only PGA Tour win. In 2000, the first of two top-10s came at the first event of the season with a T-8 in the Mercedes Championship. In 2001, he came in 4th in the
MasterCard Colonial, and tied for 6th in the
AT&T Pebble Beach National Pro-Am. In his forties, Day split his playing time between the PGA Tour and the
Nationwide Tour. He later joined the
PGA Tour Champions after turning 50. Day is notorious for being an extremely deliberate player on the golf course. In fact, the moniker "All Day," was hung on him by the legendary
Jack Nicklaus. Day is one of the few golfers to receive a slow play penalty in a non-major (1995
Honda Classic). Day is also a
golf course architect, forming Day-Blalock Golf Course Design with Alan Blalock in 1999. He has featured in the top 50 of the
Official World Golf Rankings, peaking at 30th in 2000. == Personal life ==