Day won his first Nationwide Tour event in July 2007 at the Legend Financial Group Classic, becoming the youngest man to win on any of the PGA Tour's three tours. The win jumped him to eighth on the Nationwide Tour's money list. He ended up finishing 5th on the money list to earn his PGA Tour card for 2008. He had a mediocre season, but had conditional status for 2009. A second-place finish at the Puerto Rico Open helped Day retain his card for 2010, and he finished 69th in the money list.