Early in 2006 Stadler won the Johnnie Walker Classic in Australia, gaining a two-year exemption on the European, Asian, and Australasian tours.

On February 2, 2014, Stadler won the Waste Management Phoenix Open marking his first PGA Tour victory.

Stadler was one of the few golfers to employ the use of an anchor putter, which the PGA Tour banned on January 1, 2016.

Stadler attempted a comeback on the Web.com Tour's Digital Ally Open in 2017, but he withdrew after the first round.

He entered the 2017–18 season with a Major Medical Extension that required him to earn 454.420 FedEx Cup points or $717,890 in 26 starts in order to retain his PGA Tour privileges, but was unable to meet the terms.